feat: add alias creation to pos system bank interactive menu

New 'alias' subcommand (+ POS_SUBCMDS row, menu option 6 'Manage aliases'): create/update/list/remove bash aliases that run 'pos system bank run <name>', written into ~/.bashrc inside a managed marker block (BASH_RC_FILE seam for tests, atomic tmp+mv rewrite). - alias_valid_name enforces ^[a-zA-Z][a-zA-Z0-9_-]*$ - same-name create is an idempotent retarget; last alias removal cleans the whole block; outer ~/.bashrc aliases preserved byte-identically - outer-alias collision refused (file untouched), PATH-shadow non-blocking warn, 'bank remove' drops aliases pointing at the removed command - GNU sed '1,0p' edge case (block at line 1) fixed with guarded ranges; regex-quote literalization avoided via glob case payload match - t-bank.sh +49 checks (71 -> 120); docs: POS.md, howto/system.md, tests/README.md, AGENT_TODO.md; make gen byte-idempotent (also refreshes the pos-communication-telegram-listener filetable line count so the previous commit's tree is gen-consistent)
fix: stop telegram listener crash-loop from failed background commands
2026-09-12 13:53:44 -04:00 · 2026-09-12 13:48:02 -04:00 · 2026-09-12 11:13:41 -04:00 · 2026-09-12 08:27:12 -04:00 · 2026-09-12 08:25:40 -04:00 · 2026-09-12 07:29:30 -04:00
37 changed files with 3547 additions and 523 deletions
@@ -33,3 +33,6 @@ dream.md

 # Agent process reports — local-only shared memory (not tracked)
 AgentsReport/
+
+# Task breakdown notes — never committed
+.tasks/
@@ -42,6 +42,19 @@ summary (newest last).

 ## Done

+- **`pos system bank alias`** — bash aliases for bank commands (Architect→Builder): `alias <name> [alias_name]`, `alias list`, `alias remove <alias_name>`, menu option 6 "Manage aliases", subcommand shown in `pos tree`/completion via `# POS_SUBCMDS`. Writes `alias <alias_name>='pos system bank run <name>'` lines into `~/.bashrc` inside a managed `# >>> pos bank aliases … <<<` block (`BASH_RC_FILE` seam); same alias name retargets the line, removing the last alias removes the whole block; outer-alias collision refused (line shown), PATH-shadow non-blocking warn, `bank remove` drops aliases pointing at the removed command. Fixed during build: undeclared `declare -g -A` alias map → `unbound variable`; `[[ =~ ]]` literalizes `'` → payload matched via glob `case`; **GNU sed `1,0p` prints line 1** (0 = last-line sentinel) → guarded extraction ranges so edge blocks rewrite cleanly. New `tests/t-bank.sh` Part B2 (49 alias checks). Docs: POS.md system category + detail block, howto/system.md new bank section. Verified: `bash -n`, t-bank 120 checks, `make gen` byte-idempotent, `make check`, `make lint` 0 FAIL / 0 WARN. Done 2026-09-12.
+
+- **`pos bank` command bank** — feature (41efc91) + lib registration fix (73d15a2) + main-menu visibility & `run` crash fix (c5d501a) + tab-completion of category-less tools (e23d57e) + multiline command storage/execution fix (11b4a67, v2 escaped format with backward compat). Done 2026-09-12. **2026-09-12: migrated into the `system` category → `pos system bank` (`bin/pos-system-bank`); storage seam (`bank.env`, `BANK_FILE`, v2 format) unchanged.**
+
+- **2026-09-09** — New `pos system alias` tool (Architect→Builder→Reviewer→Writer): persistent command aliases via wrapper scripts in `~/.local/bin/`. Interactive menu (create/edit/remove/list/show), storage at `~/.config/linux_post_install/aliases.env` (pipe-delimited `name|command`), wrapper sync on every invocation, name validation (`^[a-zA-Z][a-zA-Z0-9_-]*$`), ownership markers, collision checks. Docs: POS.md system category + detail block, howto/system.md recipes section. Verified: `bash -n`, `make gen` byte-idempotent, `make check` OK, `make lint` 0 FAIL / 0 WARN. **2026-09-12: removed per user request (feature no longer wanted); `bin/pos-system-alias` deleted, docs cleaned up.**
+
+- **2026-09-09** — Telegram listener single-instance guard (Toolsmith): `bin/pos-communication-telegram-listener --run` now takes a `flock(1)` on `${XDG_RUNTIME_DIR:-/tmp}/pos-telegram-listener.lock` inside `run_daemon()` (before config load/sync/poll loop) — a second `--run` on the same token fails fast (exit 1, `ERROR: listener already running (single instance) — check: systemctl --user status pos-telegram-listener`), never racing getUpdates (Telegram 409/command stealing). Kernel auto-release → no stale-lock bookkeeping, systemd `Restart=always` restarts clean. `--status` first line now reports `listener:  running (single instance lock held)` / `listener:  not running` via the same `lock_held()` probe. `flock` dep guard added (`util-linux`). New regression `tests/t-telegram-listener-singleton.sh` (7 checks: first acquires+loops, second exits 1 with exact message, lock releases → third starts clean, status reports both states; stubbed curl/systemctl, sandboxed XDG_RUNTIME_DIR — hermetic, no network). Verified: `bash -n`, `make gen` ×2 byte-idempotent, `make check` OK, `make lint` 0 FAIL / 0 WARN, `make test` green, `git diff --check` clean.
+
+- **2026-09-09** — Unified YouTube tools into `pos media yt` + new `subtitles` (Architect POS--9). New `bin/pos-media-yt` dispatcher (mp3/mp4/grab/ytsync/subtitles) + `bin/pos-media-yt-{mp3,mp4,grab,subtitles,ytsync}`; the ytsync file is a forwarder to the existing `pos media ytsync`; legacy `bin/pos-media-{mp3,mp4,grab}` became thin forwarders to the `yt` forms. New `lib/yt-lib.sh` (deps/URL-validation/echo/classify helpers; `classify_url` migrated from grab, `yt_validate_url` is a return-1 checker — never exits, so callers can prefix errors). `bin/pos` INTERACTIVE_CMDS += `media-yt-mp4` (interactive format pick reads stdin). `pos-media-yt-subtitles` extracts captions via `--write-subs --write-auto-subs --sub-langs best`, `--lang en,ar` (one `--sub-langs` arg), `srt|vtt|txt` (txt = srt→txt conversion stripping timestamps/HTML), `--auto-only`, `--list-subs` probe, `--output`, no-ffmpeg dep (yt-dlp only; dry-run skips deps entirely). Docs: DOC/POS.md media section rewritten (yt group + forwarder rows), DOC/howto/media.md `yt` commands + subtitles section, AGENT_Context hand-maintained `lib/yt-lib.sh` row, tests/README row. New `tests/t-pos-media-yt.sh` (72 checks: dispatcher/forwarder resolution, full `pos media mp3` dispatch chain, yt-lib helpers, per-tool flags/dry-run/`YT_OUT_DIR` seam/`GRAB_DEFAULT` config, 3 mandated negative controls — unsafe-URL no-expansion, `--lang en,ar` single arg, txt timestamp-stripping, unavailable-subs detection). `tests/t-config-precedence.sh` Part D config-consumer list updated `pos-media-grab` → `pos-media-yt-grab`. Verified: `bash -n` all; `make gen` ×2 byte-idempotent; `make check` OK; `make lint` 0 FAIL / 0 WARN; `make test` 21 files / 533 checks / 0 fail / 0 skip; `git diff --check` clean; smokes — `pos media yt --help`, `yt mp3/mp4/subtitles --help`, `yt ytsync --help` (reaches `pos media ytsync`), `pos media mp3 --help` forwarder, `pos tree` shows the `yt` subtree (with repo-first PATH; system `/usr/local/bin` has a stale pre-POS--9 install that shadows it otherwise).
+
+- **2026-09-08** — `install.sh` version gate (Architect→Builder): skip+abort when installed version == current version, `--force` to bypass, version scheme `0.0c<git commit count>` (auto-bumps per commit). `install_version()` derives `0.0c$(git rev-list --count HEAD)`; empty when `.git` absent → gate skipped (silently); `INSTALL_VERSION_OVERRIDE` env var (presence-check) = test seam. Gate after arg-parse, before phases, numeric comparison (strip `0.0c`, `-eq`); `log "Already installed ($CURRENT_VERSION). Use --force to re-install."` / `--dry-run` → `(dry-run) Would skip install: already at version $CURRENT_VERSION`, both exit 0. `FORCE=0` init, `--force` parse + usage. `flag_set installed_version "$CURRENT_VERSION"` after "Bootstrap complete" banner (only when DRY_RUN≠1 and version non-empty; even under --force). New `tests/t-install-version.sh` (21 checks / 9 cases). Docs: README/SCRIPTS/AGENT_Context (flags, flow, line count 248→301, tests/README row). Verified: `bash -n` clean; `make gen` idempotent; `make check` OK; `make lint` 0 FAIL / 0 WARN; `make test` suite green.
+
+
 - **2026-09-07** — `pos ai` API-key contract mismatch fixed (Architect→Builder→Reviewer; docs/history evidence): docs claimed `AI_API_KEY` was the required primary key, but `resolve_key()` read only provider-specific keys (`7ae2e77` had removed shared-key priority to fix cross-provider leakage; docs never updated). Decision C: provider key stays primary (leakage guard intact), legacy `AI_API_KEY` honored as backward-compat fallback when the provider's own key is empty; `cmd_providers()` "configured" mirrors it; `require_key()` messages byte-stable; `AI_API_KEY` NOT re-added to `# POS_CONFIG:`/`# PROVIDER_CONFIG:` registry. Docs reworded (POS.md rows 91/96/98 + precedence, howto/ai.md first-run hints, HOWTO.md, AGENT_Context 2 prose spots, config/ai.env comment). New regression `tests/t-ai-key-resolution.sh` (24 checks / 10 cases: gemini+openrouter via provider key only, via AI_API_KEY only, both→provider wins, env-wins, llamacpp no-key, missing-key message, providers configured status). Verified: suite 19 files / 440 checks / 0 fail / 0 skip; `make gen` byte-idempotent; `make check` OK; `make lint` 0 FAIL, 0 WARN; Reviewer APPROVE_WITH_NOTES with mutation-based disproof (inverted precedence → C3/C6 fail).

 - **2026-09-07** — opencode project skill: created `.opencode/skills/linux-post-install/SKILL.md` (repo had no `.opencode/`). Skill encodes the repo's operational playbook for agents: repo shape, `pos` tool model (`# POS:` header system, exec-bit, deps-guard-before-help, INTERACTIVE_CMDS, determinism), doc authority order (MAINTENANCE Phase 0: templates → DEV.md → AGENTS.md → code), Definition of Done gates (`make gen` ×2 idempotent → `make check` → `make lint` 0/0 → `make test` 18 files/416 checks), test conventions (hard-skip contract, negative controls), and repo commands (ci-status, gitea API, pos tree/config). Frontmatter validated (name matches folder, description with trigger keywords); auto-discovered at `.opencode/skills/` — no opencode.json change needed; restart opencode to load.
@@ -10,19 +10,19 @@

 <!-- GEN:START docmap -->
 | ## 1. Project Overview | 28–43 |
-| ## 2. Directory Structure | 44–210 |
-| ## 3. Installation Flow | 211–264 |
-| ## 4. The `pos` CLI System | 265–346 |
-| ## 5. Shared Library — `lib/common.sh` | 347–378 |
-| ## 6. Docker Compose / ScaleTail | 379–421 |
-| ## 7. Optional Apps (`apps/`) | 422–451 |
-| ## 8. Entertainment Module | 452–465 |
-| ## 9. Systemd Services | 466–477 |
-| ## 10. Configuration Files | 478–504 |
-| ## 11. Coding Conventions | 505–537 |
-| ## 12. Development Workflow | 538–590 |
-| ## 13. Key File Quick Reference | 591–666 |
-| ## 14. Common Tasks for Agents | 667–700 |
+| ## 2. Directory Structure | 44–217 |
+| ## 3. Installation Flow | 218–276 |
+| ## 4. The `pos` CLI System | 277–365 |
+| ## 5. Shared Library — `lib/common.sh` | 366–397 |
+| ## 6. Docker Compose / ScaleTail | 398–440 |
+| ## 7. Optional Apps (`apps/`) | 441–470 |
+| ## 8. Entertainment Module | 471–484 |
+| ## 9. Systemd Services | 485–496 |
+| ## 10. Configuration Files | 497–523 |
+| ## 11. Coding Conventions | 524–556 |
+| ## 12. Development Workflow | 557–609 |
+| ## 13. Key File Quick Reference | 610–694 |
+| ## 14. Common Tasks for Agents | 695–728 |
 <!-- GEN:END docmap -->

 ## 1. Project Overview
@@ -90,7 +90,13 @@ Linux_post_install/
 │   ├── pos-media-mp4                       # Download video as MP4 (smart/interactive format select)
 │   ├── pos-media-sync                      # Incremental Music → USB sync (mp3/mp4, add/update only)
 │   │   [deps: lsblk jq]
+│   ├── pos-media-yt-grab                   # Auto-download URL as audio or video (classify + route)
+│   ├── pos-media-yt-mp3                    # Download audio as MP3 (yt-dlp)
+│   ├── pos-media-yt-mp4                    # Download video as MP4 (smart/interactive format select)
+│   ├── pos-media-yt-subtitles              # Extract subtitles/captions from a URL (yt-dlp)
+│   ├── pos-media-yt-ytsync                 # Incrementally sync YouTube channels/playlists into ~/Videos
 │   ├── pos-media-ytsync                    # Incrementally sync YouTube channels/playlists into ~/Videos
+│   ├── pos-media-yt                        # YouTube download tools (mp3/mp4/grab/ytsync/subtitles)
 │   ├── pos-network-checkport               # Check TCP/UDP port reachability (nmap, or bash/nc fallback) + local interface view
 │   ├── pos-network-download                # aria2 RPC daemon + queue control (add/torrent/metalink, watch, limits)
 │   │   [deps: aria2c jq curl]
@@ -105,6 +111,7 @@ Linux_post_install/
 │   ├── pos-ssh-load-keys                   # Load all SSH keys into the agent
 │   ├── pos-system-backup                   # Encrypted (AES-256) folder snapshots (tar + gpg)
 │   │   [deps: tar]
+│   ├── pos-system-bank                     # Persistent command bank for saving and running shell commands
 │   ├── pos-system-firewall                 # Interactive UFW management
 │   ├── pos-system-health                   # Host health dashboard (disk, RAM, services, backup age, fail2ban, docker); exit 1 if any FAIL
 │   ├── pos-system-schedule                 # Scheduled jobs: run a command on a timer; notify on threshold/change/error/always or silently
@@ -211,7 +218,11 @@ Linux_post_install/
 ## 3. Installation Flow

 ```
-User runs: ./install.sh [--apps|--full|--feature|--dry-run|--skip <phase>|--steps <spec>]
+User runs: ./install.sh [--apps|--full|--feature|--dry-run|--force|--skip <phase>|--steps <spec>]
+│
+├─ Version gate: compares installed version (flag) vs current (0.0c<commit count>)
+│   └─ match + no --force → "Already installed. Use --force to re-install." / exit 0
+│       (--dry-run variant prints "Would skip install"); no git or no flag → skip gate
 │
 ├─ Phase 1: preinstall.sh        (requires root)
 │   └─ apt update + installs 25+ packages + yt-dlp + fail2ban
@@ -220,7 +231,7 @@ User runs: ./install.sh [--apps|--full|--feature|--dry-run|--skip <phase>|--step
 │   └─ Copies bin/* → /usr/local/bin/ (chmod 755)
 │   └─ Copies lib/*.sh (common, flags, notify, registry, entertainment-lib,
 │      scheduler-lib, config-ui, user-timers-lib, entertainment-plugin-lib,
-│      usb-lib, share-lib, menu-lib) → /usr/local/bin/ (chmod 644)
+│      usb-lib, share-lib, menu-lib, yt-lib, bank-lib) → /usr/local/bin/ (chmod 644)
 │   └─ Copies x64_bin/* → /usr/local/bin/ on x86_64 (arm64_bin/ on aarch64)
 │   └─ [if --feature] Copies features/* → /usr/local/bin/ (asks before overwriting),
 │                      then sets the matching feature flag
@@ -249,6 +260,7 @@ User runs: ./install.sh [--apps|--full|--feature|--dry-run|--skip <phase>|--step
 | `--full` | Core install + all apps (non-interactive) |
 | `--feature` | Install `features/` scripts to `/usr/local/bin/` (asks before overwriting), set their flags |
 | `--dry-run` | Preview without executing |
+| `--force` | Re-install even if the version matches |
 | `--skip <phase>` | Skip a phase (repeatable): `preinstall`, `scripts`, `postinstall`, `scalepoint`, `apps` |
 | `--steps <spec>` | Run only specific phases. Format: `1,3,4` or `1-3` |
 | `--no-color` | Disable colored output |
@@ -306,7 +318,13 @@ All non-interactive `pos` commands log output to `~/.local/share/linux_post_inst
 | media | mp3 | `pos-media-mp3` | Download audio as MP3 (yt-dlp) |  |  |
 | media | mp4 | `pos-media-mp4` | Download video as MP4 (smart/interactive format select) |  |  |
 | media | sync | `pos-media-sync` | Incremental Music → USB sync (mp3/mp4, add/update only) | lsblk jq | pos media sync --mp3 → Sync only MP3 files to USB · pos media sync --mp4 --dry-run → Preview MP4 sync without copying |
+| media | yt-grab | `pos-media-yt-grab` | Auto-download URL as audio or video (classify + route) |  |  |
+| media | yt-mp3 | `pos-media-yt-mp3` | Download audio as MP3 (yt-dlp) |  |  |
+| media | yt-mp4 | `pos-media-yt-mp4` | Download video as MP4 (smart/interactive format select) |  |  |
+| media | yt-subtitles | `pos-media-yt-subtitles` | Extract subtitles/captions from a URL (yt-dlp) |  |  |
+| media | yt-ytsync | `pos-media-yt-ytsync` | Incrementally sync YouTube channels/playlists into ~/Videos |  |  |
 | media | ytsync | `pos-media-ytsync` | Incrementally sync YouTube channels/playlists into ~/Videos |  |  |
+| media | yt | `pos-media-yt` | YouTube download tools (mp3/mp4/grab/ytsync/subtitles) |  |  |
 | network | checkport | `pos-network-checkport` | Check TCP/UDP port reachability (nmap, or bash/nc fallback) + local interface view |  |  |
 | network | download | `pos-network-download` | aria2 RPC daemon + queue control (add/torrent/metalink, watch, limits) | aria2c jq curl | pos network download add https://example.com/file.zip → Enqueue an HTTP download (auto-starts daemon) · pos network download status → Daemon health + global transfer stats · pos network download watch → Live progress view |
 | network | hotspot | `pos-network-hotspot` | Wi-Fi hotspot via create_ap + wihotspot-gui |  |  |
@@ -319,6 +337,7 @@ All non-interactive `pos` commands log output to `~/.local/share/linux_post_inst
 | share | usb-server | `pos-share-usb-server` | USB Redirector server control (--ls, --share; prompts when args omitted) |  |  |
 | ssh | load-keys | `pos-ssh-load-keys` | Load all SSH keys into the agent |  |  |
 | system | backup | `pos-system-backup` | Encrypted (AES-256) folder snapshots (tar + gpg) | tar |  |
+| system | bank | `pos-system-bank` | Persistent command bank for saving and running shell commands |  |  |
 | system | firewall | `pos-system-firewall` | Interactive UFW management |  |  |
 | system | health | `pos-system-health` | Host health dashboard (disk, RAM, services, backup age, fail2ban, docker); exit 1 if any FAIL |  |  |
 | system | schedule | `pos-system-schedule` | Scheduled jobs: run a command on a timer; notify on threshold/change/error/always or silently |  |  |
@@ -371,7 +390,7 @@ source "$(dirname "$0")/../lib/common.sh"

 **Scripts that do NOT source common.sh** (self-contained):
 <!-- GEN:START selfcontained -->
-`pos`, `pos-ai-gemini`, `pos-ai-llamacpp`, `pos-ai-openrouter`, `pos-communication-matrix-sender`, `pos-communication-telegram-listener`, `pos-communication-telegram-sender`, `pos-network-checkport`, `pos-network-hotspot`, `pos-network-ip`, `pos-network-scan`, `pos-ssh-load-keys`, `pos-system-firewall`.
+`pos`, `pos-ai-gemini`, `pos-ai-llamacpp`, `pos-ai-openrouter`, `pos-communication-matrix-sender`, `pos-communication-telegram-listener`, `pos-communication-telegram-sender`, `pos-media-grab`, `pos-media-mp3`, `pos-media-mp4`, `pos-media-yt-ytsync`, `pos-network-checkport`, `pos-network-hotspot`, `pos-network-ip`, `pos-network-scan`, `pos-ssh-load-keys`, `pos-system-firewall`.
 <!-- GEN:END selfcontained -->

 ---
@@ -592,7 +611,7 @@ Use conventional prefixes: `feat:`, `fix:`, `docs:`, `refactor:`, `chore:`

 | File | Lines | Purpose |
 |------|-------|---------|
-| `install.sh` | 248 | Main orchestrator — 4 phases with CLI flags, `--feature`, prebuilt arch bins |
+| `install.sh` | 301 | Main orchestrator — 4 phases with CLI flags, `--feature`, `--force`, version gate, prebuilt arch bins |
 | `preinstall.sh` | 76 | System packages + hotspot deps + yt-dlp + fail2ban |
 | `postinstall.sh` | 168 | fail2ban config, PATH, bash completion, systemd (flag-gated) |
 | `lib/common.sh` | 151 | Shared library (log/warn/err/run/spawn, dry-run aware, `load_system_env`, CONFIG_DIR) |
@@ -606,13 +625,15 @@ Use conventional prefixes: `feat:`, `fix:`, `docs:`, `refactor:`, `chore:`
 | `lib/share-lib.sh` | 318 | Domain layer for the share suite (usbsrv/smbclient record parsers, folder+mountpoint candidates, remote listings, service/firewall advisories; EOF-safe) + compat shims to `lib/menu-lib.sh` — used by all five `pos share *` tools |
 | `lib/menu-lib.sh` | 362 | Category-neutral interactive menu primitives (`menu_guard` tty guard, `menu_run` looping boxed menu, `menu_pick` type-to-filter picker, `menu_ask_value` prompt-with-default via raw-mode bracketed-paste-safe `menu_read_value`; stderr render, fail-closed on non-tty/EOF) — sourced by `share-lib.sh`, open to any category |
 | `lib/registry.sh` | 199 | Shared query API for POS tool metadata headers (`# POS_*:`) — `reg_scan`/`reg_list`/`reg_lookup`/`reg_each`/config scope helpers; used by `pos-tree` and `gen-docs.sh` |
+| `lib/yt-lib.sh` | 50 | Shared YouTube helpers for `pos media yt *` (`yt_check_deps`, `yt_validate_url`, `yt_echo_cmd`, `classify_url`) — sourced by `yt-mp3`/`yt-mp4`/`yt-grab`/`yt-subtitles` |
+| `lib/bank-lib.sh` | 183 | Shared Command Bank storage helpers for `pos system bank` (`bank_load`/`bank_save`/`bank_add`/`bank_remove`/`bank_update`, `{param}` template substitution, v2 `\n`-escaped multiline storage with backward-compat raw load; store `~/.config/linux_post_install/bank.env`) — sourced by `pos-system-bank` |
 | `bin/flag-reader` | 58 | Inspect flags (list/status/`--raw`) |
 | `bin/flag-set` | 21 | Set a flag (optionally with a value) |
 | `bin/flag-clear` | 21 | Unset a flag |
 | `features/autostart.sh` | 50 | Boot-time feature (moved from `bin/`, flag-gated service) |
 | `features/usb-automount.sh` | 138 | USB automount feature (udev rule + flag-gated service) |
 <!-- GEN:START filetable -->
-| `bin/pos` | 302 | CLI dispatcher with smart arg matching + logging + category help |
+| `bin/pos` | 310 | CLI dispatcher with smart arg matching + logging + category help |
 | `bin/pos-ai-alias` | 760 | manage AI agent aliases |
 | `bin/pos-ai-gemini` | 7 | Forward to pos ai --provider gemini (backward compat) |
 | `bin/pos-ai-hf` | 993 | Download AI models from Hugging Face (search, download, manage) |
@@ -622,7 +643,7 @@ Use conventional prefixes: `feat:`, `fix:`, `docs:`, `refactor:`, `chore:`
 | `bin/pos-communication-matrix-listener` | 582 | Matrix listener: map /command → bash, run them on room messages |
 | `bin/pos-communication-matrix-sender` | 215 | Send messages to a Matrix room via the client-server API (send, test, login) |
 | `bin/pos-communication-scrcpy` | 245 | Mirror/control an Android device via scrcpy+adb (mirror, devices, record, tcpip, connect, push, pull, screenshot, info) |
-| `bin/pos-communication-telegram-listener` | 815 | Telegram bot listener: map /command → bash and <prefix> → app, run them on chat messages |
+| `bin/pos-communication-telegram-listener` | 924 | Telegram bot listener: map /command → bash and <prefix> → app, run them on chat messages |
 | `bin/pos-communication-telegram-sender` | 212 | Send Telegram messages/files/links/stickers via Bot API (send, test) |
 | `bin/pos-docker-compose` | 487 | Docker Compose service manager (ls/up/down/restart/logs/update/config) |
 | `bin/pos-docker-health` | 107 | One-glance container health dashboard (exits 1 if unhealthy) |
@@ -634,11 +655,17 @@ Use conventional prefixes: `feat:`, `fix:`, `docs:`, `refactor:`, `chore:`
 | `bin/pos-entertainment-enable` | 49 | Enable an auto-trigger for a plugin on a schedule |
 | `bin/pos-entertainment-send` | 95 | Run a public-API plugin and send its output via the configured notify platforms |
 | `bin/pos-entertainment-status` | 62 | Show enabled plugins and scheduler state |
-| `bin/pos-media-grab` | 219 | Auto-download URL as audio or video (classify + route) |
-| `bin/pos-media-mp3` | 86 | Download audio as MP3 (yt-dlp) |
-| `bin/pos-media-mp4` | 132 | Download video as MP4 (smart/interactive format select) |
+| `bin/pos-media-grab` | 5 | Auto-download URL as audio or video (classify + route) |
+| `bin/pos-media-mp3` | 5 | Download audio as MP3 (yt-dlp) |
+| `bin/pos-media-mp4` | 5 | Download video as MP4 (smart/interactive format select) |
 | `bin/pos-media-sync` | 219 | Incremental Music → USB sync (mp3/mp4, add/update only) |
+| `bin/pos-media-yt-grab` | 208 | Auto-download URL as audio or video (classify + route) |
+| `bin/pos-media-yt-mp3` | 86 | Download audio as MP3 (yt-dlp) |
+| `bin/pos-media-yt-mp4` | 132 | Download video as MP4 (smart/interactive format select) |
+| `bin/pos-media-yt-subtitles` | 169 | Extract subtitles/captions from a URL (yt-dlp) |
+| `bin/pos-media-yt-ytsync` | 5 | Incrementally sync YouTube channels/playlists into ~/Videos |
 | `bin/pos-media-ytsync` | 1213 | Incrementally sync YouTube channels/playlists into ~/Videos |
+| `bin/pos-media-yt` | 33 | YouTube download tools (mp3/mp4/grab/ytsync/subtitles) |
 | `bin/pos-network-checkport` | 498 | Check TCP/UDP port reachability (nmap, or bash/nc fallback) + local interface view |
 | `bin/pos-network-download` | 1113 | aria2 RPC daemon + queue control (add/torrent/metalink, watch, limits) |
 | `bin/pos-network-hotspot` | 93 | Wi-Fi hotspot via create_ap + wihotspot-gui |
@@ -651,14 +678,15 @@ Use conventional prefixes: `feat:`, `fix:`, `docs:`, `refactor:`, `chore:`
 | `bin/pos-share-usb-server` | 362 | USB Redirector server control (--ls, --share; prompts when args omitted) |
 | `bin/pos-ssh-load-keys` | 31 | Load all SSH keys into the agent |
 | `bin/pos-system-backup` | 301 | Encrypted (AES-256) folder snapshots (tar + gpg) |
+| `bin/pos-system-bank` | 647 | Persistent command bank for saving and running shell commands |
 | `bin/pos-system-firewall` | 325 | Interactive UFW management |
 | `bin/pos-system-health` | 209 | Host health dashboard (disk, RAM, services, backup age, fail2ban, docker); exit 1 if any FAIL |
 | `bin/pos-system-schedule` | 151 | Scheduled jobs: run a command on a timer; notify on threshold/change/error/always or silently |
-| `bin/pos-system-uninstall` | 517 | Remove pos toolkit binaries, services, shell integration, config, and data |
+| `bin/pos-system-uninstall` | 518 | Remove pos toolkit binaries, services, shell integration, config, and data |
 | `bin/pos-ai` | 714 | AI assistant: ask, chat, sessions, capture, models, providers |
 | `bin/pos-config` | 80 | Interactive editor for the tools' runtime config (reads # POS_CONFIG: registry) |
 | `bin/pos-tree` | 118 | Show the pos CLI command tree: categories, commands, and subcommands |
-| `completions/pos.bash` | 314 | Dynamic bash completion |
+| `completions/pos.bash` | 330 | Dynamic bash completion |
 <!-- GEN:END filetable -->
 | `apps/install.sh` | 171 | App install/uninstall picker/orchestrator |

@@ -263,9 +263,15 @@ The standalone `vbox` command still works and forwards to `pos docker vbox` (see

 | Command | File | Purpose | Configuration |
 |---------|------|---------|---------------|
-| `pos media mp3 <url>` | `bin/pos-media-mp3` | Download audio as MP3 via yt-dlp, with thumbnail + metadata | Output to `~/Music/%(title)s.%(ext)s`, `--audio-quality 0` |
-| `pos media mp4 <url>` | `bin/pos-media-mp4` | Download video via yt-dlp with **interactive format selection** | Lists formats (`yt-dlp -F`), asks for a format ID, saves to `~/Videos/` |
-| `pos media grab <url>` | `bin/pos-media-grab` | Auto-download a URL as audio or video (classify + route to mp3/mp4) | Domain-based classification (YouTube Music/SoundCloud/Bandcamp → audio; YouTube/Vimeo/Twitch → video); `--audio`/`--video` force the mode; `--best` default for video (non-interactive); prints a clean summary (🎵/🎬 title, path, size). Config: `GRAB_DEFAULT` (`pos config grab`, default `video`) for unknown domains |
+| `pos media yt` | `bin/pos-media-yt` | YouTube download tools dispatcher (mp3/mp4/grab/ytsync/subtitles); bare invocation prints help listing subcommands | Subcommands resolved via `bin/pos-media-yt-<sub>` files |
+| `pos media yt mp3 <url>` | `bin/pos-media-yt-mp3` | Download audio as MP3 via yt-dlp, with thumbnail + metadata | Output to `~/Music/%(title)s.%(ext)s`, `--audio-quality 0`; `--by-artist` organizes as `<dir>/<artist>/<title>.mp3`. Env seam: `YT_OUT_DIR` overrides the default output dir |
+| `pos media yt mp4 <url>` | `bin/pos-media-yt-mp4` | Download video via yt-dlp with **interactive format selection** | Lists formats (`yt-dlp -F`), asks for a format ID, saves to `~/Videos/`; `-f/--best/--worst` skip the prompt. Env seam: `YT_OUT_DIR` overrides the default output dir. Reads stdin (interactive format pick) → in `INTERACTIVE_CMDS` |
+| `pos media yt grab <url>` | `bin/pos-media-yt-grab` | Auto-download a URL as audio or video (classify + route to yt-mp3/yt-mp4) | Domain-based classification (YouTube Music/SoundCloud/Bandcamp → audio; YouTube/Vimeo/Twitch → video); `--audio`/`--video` force the mode; `--best` default for video (non-interactive); prints a clean summary (🎵/🎬 title, path, size). Config: `GRAB_DEFAULT` (`pos config grab`, default `video`) for unknown domains |
+| `pos media yt ytsync [add\|sync\|list\|remove]` | `bin/pos-media-yt-ytsync` | Thin forwarder → `pos media ytsync` (incremental YouTube channel/playlist sync into `~/Videos`) | See `bin/pos-media-ytsync` below |
+| `pos media yt subtitles <url>` | `bin/pos-media-yt-subtitles` | Extract subtitles/captions from a URL (yt-dlp) | Default `--write-subs --write-auto-subs --sub-langs best`; `--lang en,ar` (comma = single `--sub-langs` arg); `--format srt` (default) / `vtt` / `txt` (srt→txt post-conversion); `--auto-only` drops manual subs; `--list-subs` probe; output to current dir (`-o ./%(title)s.%(sub_lang)s.%(ext)s`), `--output <dir>` overrides. Non-interactive; needs only yt-dlp (no ffmpeg) |
+| `pos media mp3 <url>` | `bin/pos-media-mp3` | **Forwarder** → `pos media yt mp3` (backward-compat alias) | Legacy spelling still works |
+| `pos media mp4 <url>` | `bin/pos-media-mp4` | **Forwarder** → `pos media yt mp4` (backward-compat alias) | Legacy spelling still works |
+| `pos media grab <url>` | `bin/pos-media-grab` | **Forwarder** → `pos media yt grab` (backward-compat alias) | Legacy spelling still works |
 | `pos media sync [--mp3\|--mp4]` | `bin/pos-media-sync` | Incremental Music → USB sync (add/update only — never deletes) | Copies mp3/mp4 from `$HOME/Music` (or `--source <dir>`) into `<usb>/Music/`, preserving the tree; missing or changed (size/mtime) files are copied, identical ones skipped. Same USB detection as `pos system backup` (lsblk TRAN + lsusb/by-id, mount offer for unmounted sticks, multi-stick picker). `--mp3`/`--mp4` filter by extension, neither = both; `--dry-run` previews. Config: `MEDIA_SYNC_SOURCE`, `MEDIA_SYNC_DEST`, shared `USB_MOUNT_BASE`/`USB_BYID` from `~/.config/linux_post_install/system.env`. Result notified via `lib/notify.sh`. Bare invocation on a terminal (or the `menu` subcommand) opens an interactive menu wrapping these actions (sync now mp3+mp4, dry-run preview, mp3-only, mp4-only, change source folder); flags stay scriptable |
 | `pos media ytsync [add\|sync\|list\|remove]` | `bin/pos-media-ytsync` | Incremental YouTube channel/playlist sync — first run asks for a URL (bare invocation = interactive menu; empty state goes straight to the prompt), repeat runs fetch only new videos | One yt-dlp call per new video (`bestvideo*+bestaudio/best` → MP4, metadata/chapters/thumbnail embedded, `--no-overwrites`, `--windows-filenames --trim-filenames 120`); per-source `--download-archive` (`~/.local/share/linux_post_install/ytsync/archive/<slug>.txt`) makes runs crash-safe and idempotent; registry tracks slug/type/url/subdir. Verbs never prompt (scheduler/timer safe); non-tty interactive entry prints a guard line and exits 0. `--dry-run` probes + plans with zero writes. Notify digest only when new>0 or failed>0 via `lib/notify.sh`. Config: `YTSYNC_VIDEOS_DIR`, `YTSYNC_EXTRA_ARGS` via `pos config ytsync`; automate with `pos system schedule` (`COMMAND=pos media ytsync sync`, `NOTIFY=never`) |

@@ -290,9 +296,45 @@ reported as "N videos require sign-in — skipped" (escape hatch:
 | `pos system health` | `bin/pos-system-health` | Host health dashboard: disk per mount, RAM/swap, failed systemd units, backup age, fail2ban, docker containers. Exits 1 if any check FAILs | Console-only reporter — health itself never sends notifications; forward the output with a wrapper (e.g. the Telegram/Matrix listener map `/status=pos system health`) or schedule it via `pos system schedule` with a `NOTIFY` policy. `HEALTH_BACKUP_MAX_AGE_DAYS` (default 2) and `BACKUP_SERVICE_ROOTS` come from `~/.config/linux_post_install/system.env`; `--help` shows the effective values |
 | `pos system schedule <cmd>` | `bin/pos-system-schedule` | Scheduled jobs — run a command on a timer, notify (or stay silent): `run [name\|all]`, `list`, `config`, `enable [name\|all]`, `disable [name\|all]`, `status`, `migrate`. Each job is a file in `~/.config/linux_post_install/schedule.d/<name>.env` with `INTERVAL` (`5m…59m`, `1h…23h`, `hourly`, `daily`, `weekly`, `OnCalendar=…`), `NOTIFY` policy, optional `MSG`, `RULE` (threshold only), and `COMMAND` = the literal rest of the line (pipes/quotes/`sudo` fine). Policies: `always` (full output every run), `onchange` (send when output differs from the last run; first run always sends), `onerror` (non-zero exit or empty output), `threshold` (first numeric output vs `RULE`, alert on false→true + one recovery — the old event-trigger behavior), `never` (side-effect jobs, no notify) | One systemd **user** timer pair per job (`pos-schedule-<name>.timer` + oneshot `.service`, `Persistent=true`), reconciled on `enable`/`disable`; the legacy single `pos-event-trigger` timer is auto-removed. `migrate` converts a pre-existing `event.env` rule set into `schedule.d/rule-N.env` threshold jobs. `config` is an interactive editor (add/edit/remove/enable/disable, validates interval + threshold); alerts via `lib/notify.sh`; `--dry-run` previews runs/writes/sends; jobs are arbitrary shell commands (chmod 600, same trust model as the Telegram map); starter jobs in `config/schedule.d/` auto-installed no-clobber by postinstall. Bare invocation on a terminal (or the `menu` subcommand) opens an interactive hub over these verbs (list, timer status, run-now, enable, disable, config editor) — a menu run-now asks y/N first and goes through the same `run <name>` path the systemd timers use |
 | `pos system uninstall` | `bin/pos-system-uninstall` | Safe, interactive uninstaller for the pos toolkit — scans and removes binaries, services, shell integration, config, and data in three tiers | Tier 1 (always): binaries in `/usr/local/bin/` (pos, pos-*, libs, ai-providers, entertainment plugins, prebuilt, features), systemd services (disable+remove) including runtime-created `~/.config/systemd/user/pos-*` user units, ScaleTail templates + feature-flag store under `/usr/local/share/linux_post_install/`, shell integration in `~/.bashrc` (PATH, completion, pos-ai-hook source), completion file. Tier 2 (`--config`): `~/.config/linux_post_install/` (.env files, schedule.d/, authorized_keys, rclone.conf). Tier 3 (`--data`): `~/.local/share/linux_post_install/` (ai sessions, logs, captured output). Flags: `--yes` (skip prompts, tier 1 only), `--config` (include tier 2), `--data` (include tier 3). Combine all three for nuclear removal. Git repo is never removed |
+| `pos system bank` | `bin/pos-system-bank` | Persistent command bank for saving and running shell commands — list, add, show, run, edit, remove, alias | Commands stored in `~/.config/linux_post_install/bank.env` (pipe-delimited: `name\|description\|command`, chmod 600, managed by the tool). Parameterized `{param}` templates are substituted at run time. Interactive menu on a TTY with no args. `BANK_FILE` env seam overrides the path. `alias` subcommand manages bash aliases in `~/.bashrc` inside a managed `# >>> pos bank aliases …` block (`BASH_RC_FILE` env seam) |

 A scheduled job is the recommended way to run the health dashboard on a timer: a `daily` job with `COMMAND=pos system health` and `NOTIFY=always` sends the dashboard output as the alert — no separate systemd unit needed (the old `pos-health.{service,timer}` units are gone; a legacy install may still have them failed/leftover — disable and remove them).

+#### system bank
+
+**File:** `bin/pos-system-bank`
+
+Persistent command bank for saving and running shell commands. Commands are stored in `~/.config/linux_post_install/bank.env` (pipe-delimited: `name|description|command`, chmod 600, managed by the tool). Supports parameterized templates with `{param}` placeholders that are substituted at run time (quoted for safe shell evaluation).
+
+On a TTY with no arguments, `pos system bank` opens an interactive menu (list / add / run / edit / remove).
+
+| Command | Purpose |
+|---------|---------|
+| `pos system bank list` | List all saved commands |
+| `pos system bank add <name> [desc] [cmd]` | Add a new command (interactive for missing args) |
+| `pos system bank show <name>` | Show command details and detected parameters |
+| `pos system bank run <name> [key=val …]` | Run a command (interactive for missing params) |
+| `pos system bank edit <name>` | Edit an existing command |
+| `pos system bank remove <name>` | Remove a command (also drops aliases pointing at it) |
+| `pos system bank alias <name> [alias_name]` | Add/update a bash alias for a bank command (default alias name = bank name) |
+| `pos system bank alias list` | List bash aliases from `~/.bashrc` |
+| `pos system bank alias remove <alias_name>` | Remove a bash alias |
+
+Aliases are bash aliases written into `~/.bashrc` inside a managed block
+(`# >>> pos bank aliases … <<<`, `bashrc`-path seam: `BASH_RC_FILE`), as
+`alias <alias_name>='pos system bank run <name>'` — retyping the same alias
+name retargets the line; removing the last alias removes the whole block.
+An alias name already defined outside the block is refused, and aliasing a
+command that also exists on `PATH` prints a non-blocking warning (the alias
+will shadow it in interactive shells).
+
+Example with parameters:
+
+```
+pos system bank add convert "Convert video" "ffmpeg -i {input} -crf {quality} {output}"
+pos system bank run convert input=clip.mp4 quality=23 output=clip.mkv
+```
+
 ### ssh

 | Command | File | Purpose | Configuration |
@@ -34,7 +34,8 @@ Everything that runs during the bootstrap install: `install.sh`, `preinstall.sh`
 1. **Pre-parse `--no-color`** before anything else, so colors are disabled early (`TERM=dumb` is exported).
 2. Source `lib/common.sh` (logging, `run`, `spawn`, …) and `lib/flags.sh` (feature flags).
 3. Parse CLI options.
-4. For each phase, `should_run <num> <name>` decides whether to run it:
+4. **Version gate:** derive the current version (`0.0c<git commit count>` via `install_version()`; empty when `.git` is absent). If the installed version (stored as the `installed_version` flag) matches and `--force` is not given, skip the install — with `--dry-run` it prints `(dry-run) Would skip install: already at version <v>`, otherwise `Already installed (<v>). Use --force to re-install.` and exits 0. When no `installed_version` flag exists or the current version cannot be determined (no `.git`), the gate is skipped.
+5. For each phase, `should_run <num> <name>` decides whether to run it:
   - `--skip <phase>` removes a phase (takes precedence).
   - `--steps <spec>` restricts the run to the listed phases only (`1,3,4` or `1-3`).
   - Phase map: `1=preinstall`, `2=scripts`, `3=postinstall`, `4=scalepoint` (+ `apps` handled separately).
@@ -44,7 +45,7 @@ The phases:
 | # | Phase | Script/action |
 |---|-------|----------------|
 | 1 | preinstall | `preinstall.sh` — apt packages + yt-dlp |
-| 2 | scripts | Copies `bin/*` → `/usr/local/bin/` (755), `lib/common.sh` + `lib/flags.sh` + `lib/notify.sh` + `lib/entertainment-lib.sh` + `lib/entertainment-plugin-lib.sh` + `lib/scheduler-lib.sh` + `lib/config-ui.sh` + `lib/user-timers-lib.sh` + `lib/usb-lib.sh` + `lib/share-lib.sh` + `lib/menu-lib.sh` + `lib/registry.sh` → `/usr/local/bin/` (644). Copies precompiled arch binaries from `x64_bin/` (or `arm64_bin/`) → `/usr/local/bin/`. With `--feature`: also installs `features/*` (see below) |
+| 2 | scripts | Copies `bin/*` → `/usr/local/bin/` (755), `lib/common.sh` + `lib/flags.sh` + `lib/notify.sh` + `lib/entertainment-lib.sh` + `lib/entertainment-plugin-lib.sh` + `lib/scheduler-lib.sh` + `lib/config-ui.sh` + `lib/user-timers-lib.sh` + `lib/usb-lib.sh` + `lib/share-lib.sh` + `lib/menu-lib.sh` + `lib/registry.sh` + `lib/yt-lib.sh` + `lib/bank-lib.sh` → `/usr/local/bin/` (644). Copies precompiled arch binaries from `x64_bin/` (or `arm64_bin/`) → `/usr/local/bin/`. With `--feature`: also installs `features/*` (see below) |
 | 3 | postinstall | `postinstall.sh` — PATH, completion, SSH keys, systemd |
 | 4 | scalepoint | Shallow-clones ScaleTail templates to `/usr/local/share/linux_post_install/scale-tail` |
 | 5 (opt) | apps | `apps/install.sh` when `--apps` (interactive) or `--full` (all, non-interactive) |
@@ -63,6 +64,7 @@ No config file — everything is command-line:
 | `--full` | Core install + every app (non-interactive) |
 | `--feature` | Install `features/` scripts to `/usr/local/bin/` (prompts on overwrite), sets their flags |
 | `--dry-run` | Log every action instead of executing. **Note:** applies to `install.sh` itself; `postinstall.sh` runs as a subprocess and does not inherit `DRY_RUN` |
+| `--force` | Re-install even if the version matches |
 | `--skip <phase>` | Skip a phase (repeatable): `preinstall`, `scripts`, `postinstall`, `scalepoint`, `apps` |
 | `--steps <spec>` | Run only listed phases: `1,3,4` or `1-3` |
 | `--no-color` | Disable colored output |
@@ -243,6 +245,13 @@ Sourced by `bin/pos-tree` (tree rendering incl. the `[deps: …]` annotations) a

 ---

+## lib/yt-lib.sh — shared YouTube helpers
+
+**File:** `lib/yt-lib.sh` (installed to `/usr/local/bin/yt-lib.sh`)
+**Purpose:** shared helpers for yt-dlp-based media tools (`pos media yt *`). Provides `yt_check_deps` (dependency validation for yt-dlp/ffmpeg), `yt_validate_url` (return-1 URL checker, never exits — callers prefix errors), `yt_echo_cmd` (dry-run command display), and `classify_url` (URL type classification). Sourced by `bin/pos-media-yt-mp3`, `bin/pos-media-yt-mp4`, `bin/pos-media-yt-grab`, and `bin/pos-media-yt-subtitles` via the standard fallback chain.
+
+---
+
 ## features/autostart.sh — boot-time feature

 **File:** `features/autostart.sh` (installed to `/usr/local/bin/autostart.sh` by `./install.sh --feature`)
@@ -79,7 +79,7 @@ Restart=on-failure
 WantedBy=multi-user.target
 ```

-**Configuration:** socket at `/run/ssh-agent/socket` (world-readable/writable). `~/.bashrc` (set by `postinstall.sh`) exports `SSH_AUTH_SOCK` to it. Not gated on any feature flag.
+**Configuration:** socket at `/run/ssh-agent/socket` (world-readable/writable). `~/.bashrc` (set by `postinstall.sh`) exports `SSH_AUTH_SOCK` to it. Gated on the `ssh-agent` feature flag — only enabled when the flag is set (`./install.sh --feature` or `flag-set ssh-agent`).

 ---

@@ -124,7 +124,7 @@ SIGTERM. A oneshot job that happens to be running at shutdown gets SIGKILLed

 ## Feature-flag gating

-The systemd loop in `postinstall.sh` special-cases two units:
+The systemd loop in `postinstall.sh` special-cases three units:

 ```bash
 if [ "$svc_name" = "autostart.service" ] && ! flag_is_set autostart; then
@@ -135,10 +135,15 @@ if [ "$svc_name" = "usb-automount.service" ] && ! flag_is_set usb-automount; the
    warn "usb-automount feature not installed — skipping usb-automount.service (run ./install.sh --feature)"
    continue
 fi
+if [ "$svc_name" = "ssh-agent.service" ] && ! flag_is_set ssh-agent; then
+    warn "ssh-agent feature not installed — skipping ssh-agent.service (run ./install.sh --feature)"
+    continue
+fi
 ```

 - `autostart.service` is **enabled** only when the `autostart` feature flag is set (`./install.sh --feature` or `flag-set autostart`). See [SCRIPTS.md → lib/flags.sh](SCRIPTS.md#libflagssh--feature-flags).
 - `usb-automount.service` is **enabled** only when the `usb-automount` feature flag is set — same mechanism.
+- `ssh-agent.service` is **enabled** only when the `ssh-agent` feature flag is set — same mechanism.

 ---

@@ -3,26 +3,34 @@
 Download audio and video from the web via `yt-dlp`, auto-classify URLs,
 sync your library to a USB stick, and keep YouTube channels incrementally
 up to date.
-Tools: `grab`, `mp3`, `mp4`, `sync`, `ytsync`.
+Tools: `yt mp3`, `yt mp4`, `yt grab`, `yt subtitles`, `sync`, `ytsync`.
+
+The YouTube download tools live under `pos media yt` (`mp3`, `mp4`, `grab`,
+`subtitles`, `ytsync`). The legacy standalone names `pos media mp3`, `pos media
+mp4` and `pos media grab` still work — they are thin forwarders to the `yt`
+forms.

 | Tool | What it does |
 |------|--------------|
-| `pos media grab` | Auto-classify URL and download as audio or video |
-| `pos media mp3` | Download audio, convert to MP3 |
-| `pos media mp4` | Download video with smart/interactive format selection |
+| `pos media yt mp3` | Download audio, convert to MP3 |
+| `pos media yt mp4` | Download video with smart/interactive format selection |
+| `pos media yt grab` | Auto-classify URL and download as audio or video |
+| `pos media yt subtitles` | Extract subtitles/captions from a URL |
+| `pos media yt ytsync` | Forwarder → `pos media ytsync` |
 | `pos media sync` | Incrementally copy `~/Music` onto a USB stick (mp3/mp4) |
 | `pos media ytsync` | Track YouTube channels/playlists and download only new videos into `~/Videos` |

-Requires `yt-dlp` and `ffmpeg` (`sudo apt install yt-dlp ffmpeg`); the tools
-fail with a clean error message instead of a raw `command not found` if either
-is missing.
+Requires `yt-dlp` and `ffmpeg` (`sudo apt install yt-dlp ffmpeg`) for `mp3`/
+`mp4`/`grab`; `subtitles` needs only `yt-dlp` (no ffmpeg). The tools fail with a
+clean error message instead of a raw `command not found` if a dependency is
+missing.

 ---

-## `pos media mp3` — audio as MP3
+## `pos media yt mp3` — audio as MP3

 ```bash
-pos media mp3 <url>
+pos media yt mp3 <url>        # or the legacy: pos media mp3 <url>
 ```

 Extracts and converts the audio track to MP3 in `~/Music/`. With `--by-artist`
@@ -30,8 +38,8 @@ files land in `~/Music/<artist>/<title>.mp3` (falls back to the uploader name
 when there's no artist tag), so a library stays organized.

 ```bash
-pos media mp3 https://youtube.com/watch?v=dQw4w9WgXcQ
-pos media mp3 --by-artist https://youtu.be/dQw4w9WgXcQ
+pos media yt mp3 https://youtube.com/watch?v=dQw4w9WgXcQ
+pos media yt mp3 --by-artist https://youtu.be/dQw4w9WgXcQ
 ```

 MP3s are encoded at best quality with title/artist/album/date/chapters embedded
@@ -48,15 +56,15 @@ cover art as a JPEG thumbnail. Existing files are never overwritten.

 **Recipe:** batch — loop over a list of URLs:
 ```bash
-while read -r url; do pos media mp3 --by-artist "$url"; done < urls.txt
+while read -r url; do pos media yt mp3 --by-artist "$url"; done < urls.txt
 ```

 ---

-## `pos media mp4` — video with smart format choice
+## `pos media yt mp4` — video with smart format choice

 ```bash
-pos media mp4 <url>
+pos media yt mp4 <url>        # or the legacy: pos media mp4 <url>
 ```

 Without a format flag, the available formats are shown as a **short curated
@@ -77,8 +85,8 @@ Non-interactive (scripting-friendly):
 | `--dry-run` | Print the yt-dlp command without running it |

 ```bash
-pos media mp4 --best https://youtube.com/watch?v=dQw4w9WgXcQ
-pos media mp4 -f 22 https://youtube.com/watch?v=dQw4w9WgXcQ
+pos media yt mp4 --best https://youtube.com/watch?v=dQw4w9WgXcQ
+pos media yt mp4 -f 22 https://youtube.com/watch?v=dQw4w9WgXcQ
 ```

 Videos merge to MP4 with metadata, chapters, subtitles (all languages) and the
@@ -90,13 +98,13 @@ video+audio and merges them.

 ---

-## `pos media grab` — auto-classify URL and download
+## `pos media yt grab` — auto-classify URL and download

 ```bash
-pos media grab <url>
+pos media yt grab <url>       # or the legacy: pos media grab <url>
 ```

-Smart URL classifier that routes to `pos media mp3` or `pos media mp4`
+Smart URL classifier that routes to `pos media yt mp3` or `pos media yt mp4`
 automatically based on the domain. Send a URL from your phone via Telegram and
 the bot downloads it to the right place without you thinking about it.

@@ -116,16 +124,16 @@ unrecognized domains is `video` — change it with `pos config grab` or set
 `GRAB_DEFAULT=audio` in `~/.config/linux_post_install/grab.env`.

 ```bash
-pos media grab https://music.youtube.com/watch?v=abc          # → ~/Music
-pos media grab https://youtube.com/watch?v=xyz                # → ~/Videos
-pos media grab --audio https://vimeo.com/123                  # force mp3
-pos media grab --worst https://youtu.be/abc                   # lowest quality
-pos media grab --dry-run https://soundcloud.com/artist/track  # preview only
+pos media yt grab https://music.youtube.com/watch?v=abc          # → ~/Music
+pos media yt grab https://youtube.com/watch?v=xyz                # → ~/Videos
+pos media yt grab --audio https://vimeo.com/123                  # force mp3
+pos media yt grab --worst https://youtu.be/abc                   # lowest quality
+pos media yt grab --dry-run https://soundcloud.com/artist/track  # preview only
 ```

-Non-interactive by design — `pos media mp4` receives `--best` by default so it
-never prompts for a format (critical for Telegram bot context where there's no
-TTY). Pass `--worst` if you want the smallest file.
+Non-interactive by design — `pos media yt mp4` receives `--best` by default so
+it never prompts for a format (critical for Telegram bot context where there's
+no TTY). Pass `--worst` if you want the smallest file.

 | Flag | Meaning |
 |------|---------|
@@ -140,6 +148,39 @@ TTY). Pass `--worst` if you want the smallest file.

 ---

+## `pos media yt subtitles` — extract subtitles/captions
+
+```bash
+pos media yt subtitles <url>
+```
+
+Downloads subtitles/captions from a URL via yt-dlp. Fetches manual captions and
+auto-generated captions by default (`--write-subs --write-auto-subs
+--sub-langs best` — "best" picks the manually-created track when available,
+otherwise the auto one). Output files land in the current directory as
+`<title>.<lang>.<ext>`.
+
+```bash
+pos media yt subtitles https://youtube.com/watch?v=dQw4w9WgXcQ
+pos media yt subtitles --lang en https://youtu.be/dQw4w9WgXcQ
+pos media yt subtitles --lang en,ar --format txt https://youtube.com/watch?v=dQw4w9WgXcQ
+```
+
+| Flag | Meaning |
+|------|---------|
+| `--lang <list>` | Subtitle languages, comma-separated (default `best`) — `en,ar` is passed as ONE `--sub-langs` arg |
+| `--format <fmt>` | `srt` (default) / `vtt` / `txt` — `txt` converts srt→txt (timestamps, seq numbers and HTML tags stripped) |
+| `--auto-only` | Only auto-generated captions (no manual subs) |
+| `-o, --output <dir>` | Output directory (default: current directory) |
+| `--list-subs` | List available subtitles for the URL and exit (probe only, no download) |
+| `--no-playlist` | Download only the single video |
+| `--dry-run` | Print the yt-dlp command without running it |
+
+If a video has no available subtitles the tool reports
+`unavailable subtitles for this video (try --list-subs to check)`.
+
+---
+
 ## `pos media sync` — music onto a USB stick

 ```bash
@@ -1,7 +1,8 @@
 # How-To: `pos system`

-Host care: encrypted backups, firewall, health dashboard, and uninstall. Tools:
-`backup`, `firewall`, `health`, `uninstall`.
+Host care: encrypted backups, firewall, health dashboard, uninstall, and the
+persistent command bank. Tools: `backup`, `firewall`, `health`, `uninstall`,
+`bank`.

 | Tool | What it does |
 |------|--------------|
@@ -9,6 +10,7 @@ Host care: encrypted backups, firewall, health dashboard, and uninstall. Tools:
 | `pos system backup` | gpg-encrypted (AES-256) folder snapshots |
 | `pos system firewall` | Interactive UFW ("UFW POWER") management |
 | `pos system uninstall` | Safe, interactive uninstaller for the pos toolkit |
+| `pos system bank` | Persistent command bank — save, run, and alias shell commands |

 ---

@@ -233,6 +235,39 @@ confirmation. The git repo is **never** removed — delete it manually if desire
 - "Nothing to remove" → pos toolkit is not installed (or already removed)
 - After uninstall, run `source ~/.bashrc` or restart your shell

+## `pos system bank` — persistent command bank + bash aliases
+
+```bash
+pos system bank add convert "Convert video" "ffmpeg -i {input} -crf {quality} {output}"
+pos system bank list
+pos system bank run convert input=clip.mp4 quality=23 output=clip.mkv
+pos system bank alias convert conv    # bash alias: conv='pos system bank run convert'
+pos system bank alias list
+```
+
+The bank is a persistent store of shell commands in
+`~/.config/linux_post_install/bank.env` (pipe-delimited, chmod 600, managed by
+the tool). `{param}` placeholders are substituted at run time; on a TTY with no
+arguments the tool opens an interactive menu.
+
+**Bash aliases** are written to `~/.bashrc` inside a managed block
+(`# >>> pos bank aliases … <<<`), one line per alias:
+`alias <alias_name>='pos system bank run <name>'`. Details:
+
+- Default alias name is the bank name; pass a second argument for a shorter one:
+  `pos system bank alias convert conv`.
+- Reusing an alias name **retargets** it to the new bank command; removing the
+  last alias removes the whole managed block.
+- An alias name already defined elsewhere in `~/.bashrc` is **refused** (shown
+  with its line) so the managed block never shadows your own config. Aliasing a
+  command that also exists on `PATH` prints a non-blocking notice that it will
+  shadow the real command in interactive shells.
+- `pos system bank remove <name>` also drops aliases pointing at the removed
+  command.
+
+After adding/removing an alias, run `source ~/.bashrc` (or open a new shell)
+for it to take effect.
+
 ---

 ## Related
@@ -35,6 +35,7 @@ cd Linux_post_install
 | `--apps` | Interactive app picker after core install |
 | `--full` | Core install + all apps (non-interactive) |
 | `--dry-run` | Preview without executing |
+| `--force` | Re-install even if the version matches |
 | `--skip <phase>` | Skip a phase: `preinstall`, `scripts`, `postinstall`, `scalepoint`, `apps` |
 | `--steps <spec>` | Run only specific phases, e.g. `--steps 1,3` |
 | `--no-color` | Disable colored output |
@@ -28,6 +28,9 @@ _pos_commands() {
 # ── Category list (sorted, filename-derived) ─────────────────────
 # Nested sub-tools (pos-<cat>-<a>-<b> where pos-<cat>-<a> exists) are
 # omitted from the cheat-sheet line — they are shown under their parent tool.
+# Category-less tools (pos-config, pos-tree) are emitted as their
+# own line with an empty subcommand column; a name already present as a
+# category (pos-ai vs the ai category built from pos-ai-*) is NOT duplicated.
 _pos_category_list() {
    local -A cats=()
    local cmd cat f
@@ -35,7 +38,10 @@ _pos_category_list() {
        [ -x "$f" ] || continue
        cmd="${f##*/pos-}"
        cat="${cmd%%-*}"
-        [ "$cat" = "$cmd" ] && continue
+        if [ "$cat" = "$cmd" ]; then
+            cats["$cmd"]="${cats[$cmd]:-}"
+            continue
+        fi
        cats["$cat"]+="${cmd#*-} "
    done
    local c subs joined s s2 top=() is_nested
@@ -208,6 +214,8 @@ EXAMPLES

  pos tree                                Show the command tree (categories + subcommands)

+  pos system bank run <name>              Run a saved command from the bank
+
  pos docker vbox create lab1              Create disposable Docker VM
  pos docker vbox create lab1 --dir .      Create VM using current directory
  pos docker vbox enter lab1               Shell into a Docker VM
@@ -266,7 +274,7 @@ MAIN_LOG="$LOG_DIR/pos.log"
 log_cmd() { echo "[$(date '+%Y-%m-%d %H:%M:%S')] $* → exit $2" >> "$MAIN_LOG"; }

 # Commands that read from stdin interactively — only log invocation
-INTERACTIVE_CMDS="docker-compose docker-vbox network-hotspot system-firewall media-mp4 media-sync system-backup system-uninstall share-usb-server share-smb-server share-smb-client share-nfs-client share-nfs-server communication-telegram-listener communication-matrix-listener ai ai-gemini ai-openrouter ai-llamacpp ai-alias system-schedule entertainment-config config"
+INTERACTIVE_CMDS="system-bank docker-compose docker-vbox network-hotspot system-firewall media-mp4 media-yt-mp4 media-sync system-backup system-uninstall share-usb-server share-smb-server share-smb-client share-nfs-client share-nfs-server communication-telegram-listener communication-matrix-listener ai ai-gemini ai-openrouter ai-llamacpp ai-alias system-schedule entertainment-config config"

 for ((i=n-1; i>=0; i--)); do
    cmd="pos"
@@ -8,6 +8,9 @@ CONFIG_DIR="${CONFIG_DIR:-${XDG_CONFIG_HOME:-$HOME/.config}/linux_post_install}"
 CONFIG_FILE="$CONFIG_DIR/telegram.env"
 MAP_FILE="$CONFIG_DIR/telegram_commands.env"
 PREFIX_FILE="$CONFIG_DIR/telegram_prefixes.env"
+# Persisted getUpdates offset (survives restarts so unconfirmed updates are
+# never re-delivered in a burst after a crash/restart).
+STATE_FILE="${LISTENER_STATE_FILE:-$CONFIG_DIR/telegram-listener.state}"
 API="https://api.telegram.org"
 SERVICE="pos-telegram-listener.service"
 USER_SYSTEMD_DIR="${XDG_CONFIG_HOME:-$HOME/.config}/systemd/user"
@@ -36,10 +39,12 @@ Commands:
  (none)       Interactive editor for the /command → bash map
  --enable     Install + start the systemd user service (autostarts on login)
  --disable    Stop + disable + remove the service
-  --status     Show service state and the command map
+  --status     Show service state (single-instance lock) and the command map
  --sync-commands
               Push the mapped /commands to the bot's "/" menu (setMyCommands)
-  --run        Run the polling loop in the foreground (used by the service)
+  --run        Run the polling loop in the foreground (used by the service).
+               Single instance: only one --run may poll the bot token at a
+               time — a second --run exits immediately with an error.
  prefix [word [command...]]
               Manage the text-prefix map (telegram_prefixes.env): any
               non-command message '<prefix> <text>' runs the mapped command
@@ -95,6 +100,31 @@ load_config() {
    load_env_file "$CONFIG_FILE"
 }

+# ── getUpdates offset persistence ────────────────────────────────
+# load_offset — read the last confirmed update offset from STATE_FILE.
+# Returns 0 when the file is missing/invalid (fresh start).
+load_offset() {
+    local val
+    [ -f "$STATE_FILE" ] || { printf '0'; return 0; }
+    val="$(cat "$STATE_FILE" 2>/dev/null || true)"
+    case "$val" in
+        ''|*[!0-9]*) printf '0' ;;
+        *) printf '%s' "$val" ;;
+    esac
+}
+
+# save_offset — atomically persist the last processed update offset.
+save_offset() {
+    local val="$1"
+    mkdir -p "$(dirname "$STATE_FILE")"
+    local tmp
+    tmp="$(mktemp)"
+    printf '%s\n' "$val" > "$tmp"
+    chmod 600 "$tmp"
+    mv "$tmp" "$STATE_FILE"
+    chmod 600 "$STATE_FILE"
+}
+
 # ── command map (MAP_FILE) ──────────────────────────────────────
 # Lines: /cmd=bash command, or /cmd::description=bash command. Keys keep the
 # leading slash; read via awk so values may contain '='. Entries are emitted
@@ -337,24 +367,69 @@ prefix_map_show() {
    return 1
 }

-# Run a mapped command line and reply with its output: empty output → "OK",
-# non-zero exit → "exit <rc>" + output; quiet=1 suppresses the reply (for
-# '@quiet ' entries that self-notify). Used by the /command map (60s cap)
-# and the text-prefix bridge (120s cap for app calls).
+# ── async command execution ─────────────────────────────────────
+# Commands run in the background so the listener never blocks.  stdin is
+# /dev/null (prevents interactive hangs — FFmpeg reading 'q', scripts
+# waiting for prompts); stdout+stderr go to a temp file; output is collected
+# and replied asynchronously from the main loop.
+#
+# PID → metadata arrays (populated by run_and_reply, drained by reap_commands)
+declare -A _CMD_OUT _CMD_MSG _CMD_QUIET
+#
+# No SIGCHLD reaper: `wait -n`/`wait -n -p` inside a CHLD trap is unreliable
+# on bash 5.2 (it reports "no children" even when processes have exited), so
+# a trap-based reaper silently never fires. reap_commands below polls with
+# kill -0 and reaps via `wait "$pid" || rc=$?` — simple, non-blocking, and
+# exit-code-correct (see the crash this design replaces).
+
+# run_and_reply <cmdline> <msg_id> [timeout] [quiet]
+# Starts the command in the background and returns immediately.  The main
+# loop calls reap_commands after each getUpdates cycle to collect output
+# and send replies.
 run_and_reply() {
-    local cmdline="$1" msg_id="$2" tmo="${3:-120}" quiet="${4:-0}" output rc
-    if output="$(timeout "$tmo" bash -c "$cmdline" 2>&1)"; then
-        rc=0
-    else
-        rc=$?
-    fi
-    [ "$quiet" -eq 1 ] && return
-    [ -n "$output" ] || output="OK"
-    if [ "$rc" -ne 0 ]; then
-        reply "$(printf 'exit %s\n%s' "$rc" "$output")" "$msg_id" "$rc"
-    else
-        reply "$output" "$msg_id"
-    fi
+    local cmdline="$1" msg_id="$2" tmo="${3:-120}" quiet="${4:-0}"
+    local out_file
+    out_file="$(mktemp /tmp/pos-cmd.XXXXXX)"
+    # stdin=/dev/null: prevents interactive hangs (FFmpeg 'q', read prompts).
+    # The child inherits nothing from the listener's own stdin.
+    timeout "$tmo" bash -c "$cmdline" </dev/null >"$out_file" 2>&1 &
+    local pid=$!
+    _CMD_OUT[$pid]="$out_file"
+    _CMD_MSG[$pid]="$msg_id"
+    _CMD_QUIET[$pid]="$quiet"
+}
+
+# reap_commands — called from the main loop after each getUpdates cycle.
+# Checks every tracked PID with kill -0 (non-blocking); when a process has
+# exited, reads its output file and sends the reply.  Never blocks the loop.
+reap_commands() {
+    local pid
+    for pid in "${!_CMD_OUT[@]}"; do
+        # Non-blocking: has the process exited?
+        if ! kill -0 "$pid" 2>/dev/null; then
+            # Retrieve exit code. `wait "$pid"` returns immediately since the
+            # process has exited. IMPORTANT: a bare `wait "$pid"` under
+            # `set -e` would abort the daemon on non-zero exits (the crash
+            # this code replaces), so the status is captured via `|| rc=$?`.
+            local rc=0
+            wait "$pid" 2>/dev/null || rc=$?
+            local out_file="${_CMD_OUT[$pid]}"
+            local msg_id="${_CMD_MSG[$pid]}"
+            local quiet="${_CMD_QUIET[$pid]}"
+            local output=""
+            [ -s "$out_file" ] && output="$(cat "$out_file" 2>/dev/null)"
+            rm -f "$out_file"
+            if [ "$quiet" -ne 1 ]; then
+                [ -n "$output" ] || output="OK"
+                if [ "$rc" -ne 0 ]; then
+                    reply "$(printf 'exit %s\n%s' "$rc" "$output")" "$msg_id" "$rc"
+                else
+                    reply "$output" "$msg_id"
+                fi
+            fi
+            unset _CMD_OUT[$pid] _CMD_MSG[$pid] _CMD_QUIET[$pid]
+        fi
+    done
 }

 ui_run_command() {
@@ -521,8 +596,8 @@ disable_service() {
 }

 status() {
-    if systemctl --user is-active --quiet "$SERVICE" 2>/dev/null; then
-        echo "listener:  running"
+    if lock_held; then
+        echo "listener:  running (single instance lock held)"
    else
        echo "listener:  not running"
    fi
@@ -750,7 +825,31 @@ handle_message() {
    run_and_reply "$value" "$msg_id" 60 "$quiet"
 }

+# ── single-instance guard ──────────────────────────────────────
+# flock(1) on a runtime lockfile — the kernel drops the lock when the process
+# dies, so there is no stale-lock/pidfile bookkeeping and the systemd
+# Restart=always unit restarts cleanly. Two getUpdates loops on one bot token
+# cause Telegram 409 conflicts and command stealing, so a second --run fails
+# closed instead of racing the active listener.
+LOCK_FILE="${XDG_RUNTIME_DIR:-/tmp}/pos-telegram-listener.lock"
+
+acquire_lock() {
+    exec 9>"$LOCK_FILE"
+    flock -n 9 || err "listener already running (single instance) — check: systemctl --user status pos-telegram-listener"
+}
+
+lock_held() {
+    # Non-blocking probe: acquiring then dropping the flock in a subshell
+    # succeeds only when nobody else holds it. Returns 0 when held.
+    if ( flock -n 9 ) 9>"$LOCK_FILE" 2>/dev/null; then
+        return 1
+    fi
+    return 0
+}
+
 run_daemon() {
+    command -v flock &>/dev/null || err "flock not found (install util-linux)"
+    acquire_lock
    command -v jq &>/dev/null || err "jq not found (install jq — in preinstall PACKAGES)"
    load_config
    [ -n "${TELEGRAM_BOT_TOKEN:-}" ] || err "No bot token — run 'pos config telegram'"
@@ -762,9 +861,16 @@ run_daemon() {
    fi
    sync_bot_commands || true

-    local offset=0
-    log "listener running (chat ${TELEGRAM_CHAT_ID}, owner ${TELEGRAM_OWNER_ID:-unset}) — Ctrl+C to stop"
-    trap 'kill $(jobs -p) 2>/dev/null; exit 0' TERM INT
+    # Resume from the last persisted update offset so unconfirmed updates are
+    # not re-delivered in a burst after a crash/restart (systemd Restart=always
+    # used to restart from 0 and re-run duplicate commands).
+    local offset
+    offset="$(load_offset)"
+    log "listener running (chat ${TELEGRAM_CHAT_ID}, owner ${TELEGRAM_OWNER_ID:-unset}, offset ${offset}) — Ctrl+C to stop"
+    # No SIGCHLD reaper here: `wait -n` inside a CHLD trap is unreliable on
+    # bash 5.2 (see the note near the _CMD_* arrays). reap_commands handles
+    # finished children after each polling cycle.
+    trap 'kill $(jobs -p) 2>/dev/null; rm -f /tmp/pos-cmd.* 2>/dev/null; wait 2>/dev/null; exit 0' TERM INT
    while true; do
        local resp n i
        resp="$(curl -fsS -m 45 "${API}/bot${TELEGRAM_BOT_TOKEN}/getUpdates" \
@@ -785,6 +891,7 @@ run_daemon() {
            msg_id="$(printf '%s' "$resp" | jq -r ".result[$i].message.message_id // empty")"
            reply_text="$(printf '%s' "$resp" | jq -r ".result[$i].message.reply_to_message.text // .result[$i].message.reply_to_message.caption // empty")"
            offset=$((u + 1))
+            save_offset "$offset"
            [ -n "$text" ] || continue
            if [ -z "${TELEGRAM_OWNER_ID:-}" ]; then
                warn "TELEGRAM_OWNER_ID unset — ignoring command (set it with 'pos config telegram')"
@@ -799,6 +906,8 @@ run_daemon() {
            fi
            handle_message "$text" "$msg_id" "$reply_text"
        done
+        # Collect output from finished background commands and send replies.
+        reap_commands
    done
 }

@@ -1,219 +1,5 @@
 #!/usr/bin/env bash
 set -euo pipefail
 # POS: media grab — Auto-download URL as audio or video (classify + route)
-# POS_FLAGS: --audio --video --best --worst --output --no-playlist --cookies --dry-run
-# POS_CONFIG: grab | grab.env | GRAB_DEFAULT=:Default mode for unknown domains (video or audio, default video)
-
-source "$(dirname "$0")/../lib/common.sh" 2>/dev/null || source "$(dirname "$0")/common.sh"
-
-# Shared config loader (canonical KEY=VALUE parser, env-wins precedence)
-source "$(dirname "$0")/../lib/config-ui.sh" 2>/dev/null || source "$(dirname "$0")/config-ui.sh"
-
-# Load grab.env config (env-seam: GRAB_DEFAULT)
-load_grab_config() {
-    load_env_file "$CONFIG_DIR/grab.env"
-}
-
-load_grab_config
-
-# ── URL classification ─────────────────────────────────────────
-classify_url() {
-    local url="$1" mode="${GRAB_DEFAULT:-video}"
-    case "$url" in
-        *music.youtube.com*)  echo "audio" ;;
-        *soundcloud.com*)     echo "audio" ;;
-        *bandcamp.com*)       echo "audio" ;;
-        *youtube.com*|*youtu.be*) echo "video" ;;
-        *vimeo.com*)          echo "video" ;;
-        *twitch.tv*)          echo "video" ;;
-        *)                    echo "$mode" ;;
-    esac
-}
-
-usage() {
-    cat <<EOF
-Usage: pos media grab [options] <url>
-
-Auto-download a URL as audio or video. Classifies the domain and delegates
-to 'pos media mp3' (audio) or 'pos media mp4' (video).
-
-Options:
-  --audio               Force audio (mp3) download
-  --video               Force video (mp4) download
-  --best                Best quality for video (default for non-interactive)
-  --worst               Lowest quality for video
-  -o, --output <dir>    Output directory (passed to mp3/mp4)
-  --no-playlist         Download only the single video
-  --cookies <file>      Netscape cookies.txt for age-gated content
-  --dry-run             Print the command that would run, don't execute
-  -h, --help            This help
-
-Examples:
-  pos media grab https://music.youtube.com/watch?v=abc
-  pos media grab https://youtube.com/watch?v=xyz
-  pos media grab --audio https://vimeo.com/123
-  pos media grab --worst https://youtu.be/abc
-  pos media grab --dry-run https://soundcloud.com/artist/track
-EOF
-    exit 0
-}
-
-# ── Arg parsing ────────────────────────────────────────────────
-URL=""
-FORCE_AUDIO=0
-FORCE_VIDEO=0
-BEST=0
-WORST=0
-DRY_RUN=0
-EXTRA_ARGS=()
-
-while [[ $# -gt 0 ]]; do
-    case "$1" in
-        -h|--help) usage ;;
-        --audio) FORCE_AUDIO=1; shift ;;
-        --video) FORCE_VIDEO=1; shift ;;
-        --best)  BEST=1; shift ;;
-        --worst) WORST=1; shift ;;
-        -o|--output)
-            [ $# -ge 2 ] || err "pos media grab: --output needs a value"
-            EXTRA_ARGS+=(--output "$2"); shift 2 ;;
-        --no-playlist) EXTRA_ARGS+=(--no-playlist); shift ;;
-        --cookies)
-            [ $# -ge 2 ] || err "pos media grab: --cookies needs a value"
-            EXTRA_ARGS+=(--cookies "$2"); shift 2 ;;
-        --dry-run) DRY_RUN=1; shift ;;
-        -*) err "pos media grab: Unknown option: $1 (see --help)" ;;
-        *)
-            [ -z "$URL" ] && URL="$1" && shift || err "pos media grab: Unexpected argument: $1" ;;
-    esac
-done
-
-[ -n "$URL" ] || usage
-
-# Validate URL scheme
-case "$URL" in
-    http://*|https://*) ;;
-    *) err "pos media grab: not a valid URL: $URL (must start with http:// or https://)" ;;
-esac
-
-# Validate mutually exclusive overrides
-[ "$FORCE_AUDIO" -eq 1 ] && [ "$FORCE_VIDEO" -eq 1 ] && \
-    err "pos media grab: --audio and --video are mutually exclusive"
-[ "$BEST" -eq 1 ] && [ "$WORST" -eq 1 ] && \
-    err "pos media grab: --best and --worst are mutually exclusive"
-
-# ── Classification ─────────────────────────────────────────────
-mode=""
-if [ "$FORCE_AUDIO" -eq 1 ]; then
-    mode="audio"
-elif [ "$FORCE_VIDEO" -eq 1 ]; then
-    mode="video"
-else
-    mode="$(classify_url "$URL")"
-fi
-
-# ── Build delegated command ────────────────────────────────────
-DELEGATE_ARGS=()
-
-if [ "$mode" = "audio" ]; then
-    DELEGATE_ARGS=(pos media mp3 "${EXTRA_ARGS[@]}")
-else
-    # mp4 route: --best by default (non-interactive), --worst if user passes it
-    if [ "$WORST" -eq 1 ]; then
-        DELEGATE_ARGS=(pos media mp4 --worst "${EXTRA_ARGS[@]}")
-    else
-        DELEGATE_ARGS=(pos media mp4 --best "${EXTRA_ARGS[@]}")
-    fi
-fi
-
-# ── Dry run ────────────────────────────────────────────────────
-if [ "$DRY_RUN" -eq 1 ]; then
-    echo "${DELEGATE_ARGS[*]} $URL"
-    exit 0
-fi
-
-# ── Execute ────────────────────────────────────────────────────
-output=""
-rc=0
-if output=$("${DELEGATE_ARGS[@]}" "$URL" 2>&1); then
-    rc=0
-else
-    rc=$?
-fi
-
-if [ "$rc" -ne 0 ]; then
-    # Summarize stderr for the user
-    summary="$(printf '%s' "$output" | grep -i 'error\|fail' | head -1 || true)"
-    [ -z "$summary" ] && summary="exit code $rc"
-    err "pos media grab: ❌ Download failed: $summary"
-fi
-
-# ── Metadata + summary ────────────────────────────────────────
-title=""
-duration=""
-file_path=""
-
-# Determine expected output directory
-if [ "$mode" = "audio" ]; then
-    out_dir="$HOME/Music"
-    for (( i=0; i<${#EXTRA_ARGS[@]}; i++ )); do
-        if [ "${EXTRA_ARGS[$i]}" = "--output" ] && [ $(( i + 1 )) -lt ${#EXTRA_ARGS[@]} ]; then
-            out_dir="${EXTRA_ARGS[$(( i + 1 ))]}"
-            break
-        fi
-    done
-    file_ext="mp3"
-else
-    out_dir="$HOME/Videos"
-    for (( i=0; i<${#EXTRA_ARGS[@]}; i++ )); do
-        if [ "${EXTRA_ARGS[$i]}" = "--output" ] && [ $(( i + 1 )) -lt ${#EXTRA_ARGS[@]} ]; then
-            out_dir="${EXTRA_ARGS[$(( i + 1 ))]}"
-            break
-        fi
-    done
-    file_ext="mp4"
-fi
-
-# Fetch metadata (fast, no download)
-if command -v yt-dlp &>/dev/null; then
-    meta="$(yt-dlp --print title --print duration_string --no-warnings "$URL" 2>/dev/null || true)"
-    title="$(printf '%s' "$meta" | sed -n '1p')"
-    duration="$(printf '%s' "$meta" | sed -n '2p')"
-fi
-
-# Find the downloaded file (most recent matching extension in out_dir)
-if [ -d "$out_dir" ]; then
-    file_path="$(find "$out_dir" -maxdepth 1 -name "*.$file_ext" -printf '%T@ %p\n' 2>/dev/null \
-        | sort -rn | head -1 | cut -d' ' -f2- || true)"
-fi
-
-# Build summary
-[ -z "$title" ] && title="$(basename "$URL" | sed 's/[?#].*//')"
-[ -z "$duration" ] && duration="?"
-
-if [ "$mode" = "audio" ]; then
-    emoji="🎵"
-else
-    emoji="🎬"
-fi
-
-echo "$emoji Downloaded: $title ($duration)"
-
-if [ -n "$file_path" ] && [ -f "$file_path" ]; then
-    file_size="$(stat --printf='%s' "$file_path" 2>/dev/null || echo "0")"
-    # Format size in human-readable form
-    if [ "$file_size" -ge 1073741824 ]; then
-        size_human="$(awk "BEGIN { printf \"%.1f GB\", $file_size / 1073741824 }")"
-    elif [ "$file_size" -ge 1048576 ]; then
-        size_human="$(awk "BEGIN { printf \"%.1f MB\", $file_size / 1048576 }")"
-    elif [ "$file_size" -ge 1024 ]; then
-        size_human="$(awk "BEGIN { printf \"%.1f KB\", $file_size / 1024 }")"
-    else
-        size_human="${file_size} B"
-    fi
-    # Show path relative to HOME
-    rel_path="${file_path/#$HOME/\~}"
-    echo "📁 $rel_path ($size_human)"
-else
-    echo "📁 $out_dir/ ($file_ext)"
-fi
+# -h|--help forwarded via exec below
+exec pos media yt grab "$@"
@@ -1,86 +1,5 @@
 #!/usr/bin/env bash
 set -euo pipefail
 # POS: media mp3 — Download audio as MP3 (yt-dlp)
-# POS_FLAGS: --output --no-playlist --cookies --by-artist --dry-run
-
-source "$(dirname "$0")/../lib/common.sh" 2>/dev/null || source "$(dirname "$0")/common.sh"
-
-# --dry-run is parsed before the deps guards (below): it previews the yt-dlp
-# command without requiring yt-dlp/ffmpeg to be installed.
-DRY_RUN=0
-for arg in "$@"; do
-    [ "$arg" = "--dry-run" ] && DRY_RUN=1
-done
-
-# Deps guards sit before -h|--help (help also errors on a box missing the deps).
-if [ "$DRY_RUN" -eq 0 ]; then
-    command -v yt-dlp &>/dev/null || err "yt-dlp not found — install it with: sudo apt install yt-dlp"
-    command -v ffmpeg &>/dev/null || err "ffmpeg not found (needed for MP3 conversion) — install it with: sudo apt install ffmpeg"
-fi
-
-OUT_DIR="$HOME/Music"
-BY_ARTIST=0
-EXTRA_ARGS=()
-
-usage() {
-    cat <<EOF
-Usage: pos media mp3 [options] <url>
-
-Download audio from a URL and convert to MP3 via yt-dlp.
-
-Options:
-  -o, --output <dir>    Output directory (default: $OUT_DIR)
-  --by-artist           Organize as <dir>/<artist>/<title>.mp3
-  --no-playlist         Download only the single video
-  --cookies <file>      Netscape cookies.txt for age-gated content
-  --dry-run             Print the yt-dlp command without running it
-  -h, --help            This help
-
-Examples:
-  pos media mp3 https://youtube.com/watch?v=dQw4w9WgXcQ
-  pos media mp3 --by-artist --no-playlist https://youtu.be/dQw4w9WgXcQ
-  pos media mp3 --cookies ~/cookies.txt https://vimeo.com/123
-EOF
-    exit 0
-}
-
-URL=""
-while [[ $# -gt 0 ]]; do
-    case "$1" in
-        -h|--help) usage ;;
-        -o|--output)
-            [ $# -ge 2 ] || err "--output needs a value"
-            OUT_DIR="$2"; shift 2 ;;
-        --by-artist) BY_ARTIST=1; shift ;;
-        --no-playlist) EXTRA_ARGS+=(--no-playlist); shift ;;
-        --cookies)
-            [ $# -ge 2 ] || err "--cookies needs a value"
-            [ -f "$2" ] || err "cookies file not found: $2"
-            EXTRA_ARGS+=(--cookies "$2"); shift 2 ;;
-        --dry-run) DRY_RUN=1; shift ;;
-        -*) err "Unknown option: $1 (see --help)" ;;
-        *)
-            [ -z "$URL" ] && URL="$1" && shift || err "Unexpected argument: $1" ;;
-    esac
-done
-[ -n "$URL" ] || usage
-
-if [ "$BY_ARTIST" -eq 1 ]; then
-    OUT_TEMPLATE="$OUT_DIR/%(artist,uploader)s/%(title)s.%(ext)s"
-else
-    OUT_TEMPLATE="$OUT_DIR/%(title)s.%(ext)s"
-fi
-
-args=(yt-dlp -x --audio-format mp3 --audio-quality 0
-    --embed-metadata --embed-chapters
-    --embed-thumbnail --convert-thumbnails jpg
-    --parse-metadata "%(artist,uploader)s:%(artist)s"
-    --no-overwrites
-    -o "$OUT_TEMPLATE"
-    "${EXTRA_ARGS[@]}" "$URL")
-
-if [ "$DRY_RUN" -eq 1 ]; then
-    echo "yt-dlp ${args[*]:1}"
-else
-    spawn "downloading audio → $OUT_DIR" "${args[@]}"
-fi
+# -h|--help forwarded via exec below
+exec pos media yt mp3 "$@"
@@ -1,132 +1,5 @@
 #!/usr/bin/env bash
 set -euo pipefail
 # POS: media mp4 — Download video as MP4 (smart/interactive format select)
-# POS_FLAGS: --format --best --worst --output --no-playlist --cookies --dry-run
-
-source "$(dirname "$0")/../lib/common.sh" 2>/dev/null || source "$(dirname "$0")/common.sh"
-
-# --dry-run is parsed before the deps guards (below): it previews the yt-dlp
-# command without requiring yt-dlp/ffmpeg to be installed.
-DRY_RUN=0
-for arg in "$@"; do
-    [ "$arg" = "--dry-run" ] && DRY_RUN=1
-done
-
-# Deps guards sit before -h|--help (help also errors on a box missing the deps).
-if [ "$DRY_RUN" -eq 0 ]; then
-    command -v yt-dlp &>/dev/null || err "yt-dlp not found — install it with: sudo apt install yt-dlp"
-    command -v ffmpeg &>/dev/null || err "ffmpeg not found (needed for MP4 merge) — install it with: sudo apt install ffmpeg"
-fi
-
-OUT_DIR="$HOME/Videos"
-FORMAT=""
-BEST=0
-WORST=0
-EXTRA_ARGS=()
-
-usage() {
-    cat <<EOF
-Usage: pos media mp4 [options] <url>
-
-Download video from a URL via yt-dlp. Without -f/--best/--worst, formats are
-listed and picked interactively.
-
-Options:
-  -f, --format <id>     Download that format id directly (no prompt)
-  --best                Best video + audio (no prompt)
-  --worst               Lowest quality (no prompt)
-  -o, --output <dir>    Output directory (default: $OUT_DIR)
-  --no-playlist         Download only the single video
-  --cookies <file>      Netscape cookies.txt for age-gated content
-  --dry-run             Print the yt-dlp command without running it
-  -h, --help            This help
-
-Examples:
-  pos media mp4 https://youtube.com/watch?v=dQw4w9WgXcQ
-  pos media mp4 --best https://youtube.com/watch?v=dQw4w9WgXcQ
-  pos media mp4 -f 22 https://youtube.com/watch?v=dQw4w9WgXcQ
-EOF
-    exit 0
-}
-
-URL=""
-while [[ $# -gt 0 ]]; do
-    case "$1" in
-        -h|--help) usage ;;
-        -f|--format)
-            [ $# -ge 2 ] || err "--format needs a value"
-            FORMAT="$2"; shift 2 ;;
-        --best) BEST=1; shift ;;
-        --worst) WORST=1; shift ;;
-        -o|--output)
-            [ $# -ge 2 ] || err "--output needs a value"
-            OUT_DIR="$2"; shift 2 ;;
-        --no-playlist) EXTRA_ARGS+=(--no-playlist); shift ;;
-        --cookies)
-            [ $# -ge 2 ] || err "--cookies needs a value"
-            [ -f "$2" ] || err "cookies file not found: $2"
-            EXTRA_ARGS+=(--cookies "$2"); shift 2 ;;
-        --dry-run) DRY_RUN=1; shift ;;
-        -*) err "Unknown option: $1 (see --help)" ;;
-        *)
-            [ -z "$URL" ] && URL="$1" && shift || err "Unexpected argument: $1" ;;
-    esac
-done
-[ -n "$URL" ] || usage
-
-[ -n "$FORMAT" ] && { [ "$BEST" -eq 1 ] || [ "$WORST" -eq 1 ]; } \
-    && err "--format and --best/--worst are mutually exclusive"
-[ "$BEST" -eq 1 ] && [ "$WORST" -eq 1 ] && err "--best and --worst are mutually exclusive"
-
-# Resolve the format selector: explicit flag → smart preset → interactive.
-# The curated table goes to stderr; stdout carries ONLY the chosen format id
-# (same ui_pick lesson — a $(...) capture must not swallow the menu).
-fmt_spec=""
-if [ -n "$FORMAT" ]; then
-    fmt_spec="$FORMAT"
-elif [ "$BEST" -eq 1 ]; then
-    fmt_spec="bestvideo*+bestaudio/best"
-elif [ "$WORST" -eq 1 ]; then
-    fmt_spec="worst"
-else
-    table="$(yt-dlp -F "$URL" 2>&1)" || {
-        echo "ERROR: no formats listed (unsupported site or age-gated content)" >&2
-        exit 1
-    }
-    printf '%s' "$table" | awk -F'[[:space:]][[:space:]]+' '
-        NR <= 2 { print; next }
-        $0 ~ /^-+$/ { print; next }
-        $0 ~ /audio only/ && $0 !~ /storyboard/ && $1 !~ /^sb/ { print "  [audio] " $0; next }
-        $0 ~ /video only/ && $1 !~ /^sb/ { print "  [video] " $0; next }
-        $1 ~ /^[0-9]+$/ && $2 ~ /^(mp4|webm)$/ && $3 ~ /x/ { print "  [combo] " $0 }
-    ' >&2
-    echo >&2
-    read -rp "Format ID ('best'/'worst'/empty = best): " chosen
-    case "${chosen:-best}" in
-        best) fmt_spec="bestvideo*+bestaudio/best" ;;
-        worst) fmt_spec="worst" ;;
-        *)
-            if printf '%s' "$table" | grep -qE "^[[:space:]]*${chosen}[[:space:]]"; then
-                fmt_spec="$chosen"
-            else
-                echo "ERROR: unknown format id '$chosen'" >&2
-                exit 1
-            fi
-            ;;
-    esac
-fi
-
-args=(yt-dlp -f "$fmt_spec"
-    --merge-output-format mp4
-    --embed-metadata --embed-chapters
-    --embed-subs --sub-langs all
-    --embed-thumbnail
-    --no-overwrites
-    -o "$OUT_DIR/%(title)s.%(ext)s"
-    "${EXTRA_ARGS[@]}" "$URL")
-
-if [ "$DRY_RUN" -eq 1 ]; then
-    echo "yt-dlp ${args[*]:1}"
-else
-    spawn "downloading video → $OUT_DIR" "${args[@]}"
-fi
+# -h|--help forwarded via exec below
+exec pos media yt mp4 "$@"
@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+set -euo pipefail
+# POS: media yt — YouTube download tools (mp3/mp4/grab/ytsync/subtitles)
+# POS_SUBCMDS: mp3 mp4 grab ytsync subtitles
+source "$(dirname "$0")/../lib/common.sh" 2>/dev/null || source "$(dirname "$0")/common.sh"
+
+usage() {
+    cat <<'EOF'
+Usage: pos media yt <command> [args]
+
+YouTube download tools: audio, video, auto-grab, subtitles, channel sync.
+
+Commands:
+  mp3 <url>          Download audio as MP3
+  mp4 <url>          Download video as MP4 (interactive format select)
+  grab <url>         Auto-download as audio or video
+  ytsync [cmd]       Incremental YouTube channel sync
+  subtitles <url>    Extract subtitles/captions
+
+Options:
+  -h, --help         This help
+
+Run 'pos media yt <command> --help' for details.
+EOF
+    exit 0
+}
+
+case "${1:-}" in
+    -h|--help|"") usage ;;
+esac
+# Subcommands are resolved by the dispatcher via pos-media-yt-<sub> files.
+# This file only handles bare 'pos media yt' (help) and unknown args.
+err "unknown yt command: $1 (see 'pos media yt --help')"
@@ -0,0 +1,208 @@
+#!/usr/bin/env bash
+set -euo pipefail
+# POS: media yt-grab — Auto-download URL as audio or video (classify + route)
+# POS_FLAGS: --audio --video --best --worst --output --no-playlist --cookies --dry-run
+# POS_CONFIG: grab | grab.env | GRAB_DEFAULT=:Default mode for unknown domains (video or audio, default video)
+
+source "$(dirname "$0")/../lib/common.sh" 2>/dev/null || source "$(dirname "$0")/common.sh"
+
+# Shared config loader (canonical KEY=VALUE parser, env-wins precedence)
+source "$(dirname "$0")/../lib/config-ui.sh" 2>/dev/null || source "$(dirname "$0")/config-ui.sh"
+
+# Shared yt helpers (classify_url, yt_validate_url, yt_check_deps, yt_echo_cmd)
+source "$(dirname "$0")/../lib/yt-lib.sh" 2>/dev/null || source "$(dirname "$0")/yt-lib.sh"
+
+# Load grab.env config (env-seam: GRAB_DEFAULT)
+load_grab_config() {
+    load_env_file "$CONFIG_DIR/grab.env"
+}
+
+load_grab_config
+
+usage() {
+    cat <<EOF
+Usage: pos media yt grab [options] <url>
+
+Auto-download a URL as audio or video. Classifies the domain and delegates
+to 'pos media yt mp3' (audio) or 'pos media yt mp4' (video).
+
+Options:
+  --audio               Force audio (mp3) download
+  --video               Force video (mp4) download
+  --best                Best quality for video (default for non-interactive)
+  --worst               Lowest quality for video
+  -o, --output <dir>    Output directory (passed to mp3/mp4)
+  --no-playlist         Download only the single video
+  --cookies <file>      Netscape cookies.txt for age-gated content
+  --dry-run             Print the command that would run, don't execute
+  -h, --help            This help
+
+Examples:
+  pos media yt grab https://music.youtube.com/watch?v=abc
+  pos media yt grab https://youtube.com/watch?v=xyz
+  pos media yt grab --audio https://vimeo.com/123
+  pos media yt grab --worst https://youtu.be/abc
+  pos media yt grab --dry-run https://soundcloud.com/artist/track
+
+The legacy spelling 'pos media grab' still works (forwarder) and is equivalent.
+EOF
+    exit 0
+}
+
+# ── Arg parsing ────────────────────────────────────────────────
+URL=""
+FORCE_AUDIO=0
+FORCE_VIDEO=0
+BEST=0
+WORST=0
+DRY_RUN=0
+EXTRA_ARGS=()
+
+while [[ $# -gt 0 ]]; do
+    case "$1" in
+        -h|--help) usage ;;
+        --audio) FORCE_AUDIO=1; shift ;;
+        --video) FORCE_VIDEO=1; shift ;;
+        --best)  BEST=1; shift ;;
+        --worst) WORST=1; shift ;;
+        -o|--output)
+            [ $# -ge 2 ] || err "yt-grab: --output needs a value"
+            EXTRA_ARGS+=(--output "$2"); shift 2 ;;
+        --no-playlist) EXTRA_ARGS+=(--no-playlist); shift ;;
+        --cookies)
+            [ $# -ge 2 ] || err "yt-grab: --cookies needs a value"
+            EXTRA_ARGS+=(--cookies "$2"); shift 2 ;;
+        --dry-run) DRY_RUN=1; shift ;;
+        -*) err "yt-grab: Unknown option: $1 (see --help)" ;;
+        *)
+            [ -z "$URL" ] && URL="$1" && shift || err "yt-grab: Unexpected argument: $1" ;;
+    esac
+done
+
+[ -n "$URL" ] || usage
+
+# Validate URL scheme
+yt_validate_url "$URL" 2>/dev/null || \
+    err "yt-grab: not a valid URL: $URL (must start with http:// or https://)"
+
+# Validate mutually exclusive overrides
+[ "$FORCE_AUDIO" -eq 1 ] && [ "$FORCE_VIDEO" -eq 1 ] && \
+    err "yt-grab: --audio and --video are mutually exclusive"
+[ "$BEST" -eq 1 ] && [ "$WORST" -eq 1 ] && \
+    err "yt-grab: --best and --worst are mutually exclusive"
+
+# ── Classification ─────────────────────────────────────────────
+mode=""
+if [ "$FORCE_AUDIO" -eq 1 ]; then
+    mode="audio"
+elif [ "$FORCE_VIDEO" -eq 1 ]; then
+    mode="video"
+else
+    mode="$(classify_url "$URL")"
+fi
+
+# ── Build delegated command ────────────────────────────────────
+DELEGATE_ARGS=()
+
+if [ "$mode" = "audio" ]; then
+    DELEGATE_ARGS=(pos media yt mp3 "${EXTRA_ARGS[@]}")
+else
+    # mp4 route: --best by default (non-interactive), --worst if user passes it
+    if [ "$WORST" -eq 1 ]; then
+        DELEGATE_ARGS=(pos media yt mp4 --worst "${EXTRA_ARGS[@]}")
+    else
+        DELEGATE_ARGS=(pos media yt mp4 --best "${EXTRA_ARGS[@]}")
+    fi
+fi
+
+# ── Dry run ────────────────────────────────────────────────────
+if [ "$DRY_RUN" -eq 1 ]; then
+    echo "${DELEGATE_ARGS[*]} $URL"
+    exit 0
+fi
+
+# ── Execute ────────────────────────────────────────────────────
+output=""
+rc=0
+if output=$("${DELEGATE_ARGS[@]}" "$URL" 2>&1); then
+    rc=0
+else
+    rc=$?
+fi
+
+if [ "$rc" -ne 0 ]; then
+    # Summarize stderr for the user
+    summary="$(printf '%s' "$output" | grep -i 'error\|fail' | head -1 || true)"
+    [ -z "$summary" ] && summary="exit code $rc"
+    err "yt-grab: ❌ Download failed: $summary"
+fi
+
+# ── Metadata + summary ────────────────────────────────────────
+title=""
+duration=""
+file_path=""
+
+# Determine expected output directory
+if [ "$mode" = "audio" ]; then
+    out_dir="$HOME/Music"
+    for (( i=0; i<${#EXTRA_ARGS[@]}; i++ )); do
+        if [ "${EXTRA_ARGS[$i]}" = "--output" ] && [ $(( i + 1 )) -lt ${#EXTRA_ARGS[@]} ]; then
+            out_dir="${EXTRA_ARGS[$(( i + 1 ))]}"
+            break
+        fi
+    done
+    file_ext="mp3"
+else
+    out_dir="$HOME/Videos"
+    for (( i=0; i<${#EXTRA_ARGS[@]}; i++ )); do
+        if [ "${EXTRA_ARGS[$i]}" = "--output" ] && [ $(( i + 1 )) -lt ${#EXTRA_ARGS[@]} ]; then
+            out_dir="${EXTRA_ARGS[$(( i + 1 ))]}"
+            break
+        fi
+    done
+    file_ext="mp4"
+fi
+
+# Fetch metadata (fast, no download)
+if command -v yt-dlp &>/dev/null; then
+    meta="$(yt-dlp --print title --print duration_string --no-warnings "$URL" 2>/dev/null || true)"
+    title="$(printf '%s' "$meta" | sed -n '1p')"
+    duration="$(printf '%s' "$meta" | sed -n '2p')"
+fi
+
+# Find the downloaded file (most recent matching extension in out_dir)
+if [ -d "$out_dir" ]; then
+    file_path="$(find "$out_dir" -maxdepth 1 -name "*.$file_ext" -printf '%T@ %p\n' 2>/dev/null \
+        | sort -rn | head -1 | cut -d' ' -f2- || true)"
+fi
+
+# Build summary
+[ -z "$title" ] && title="$(basename "$URL" | sed 's/[?#].*//')"
+[ -z "$duration" ] && duration="?"
+
+if [ "$mode" = "audio" ]; then
+    emoji="🎵"
+else
+    emoji="🎬"
+fi
+
+echo "$emoji Downloaded: $title ($duration)"
+
+if [ -n "$file_path" ] && [ -f "$file_path" ]; then
+    file_size="$(stat --printf='%s' "$file_path" 2>/dev/null || echo "0")"
+    # Format size in human-readable form
+    if [ "$file_size" -ge 1073741824 ]; then
+        size_human="$(awk "BEGIN { printf \"%.1f GB\", $file_size / 1073741824 }")"
+    elif [ "$file_size" -ge 1048576 ]; then
+        size_human="$(awk "BEGIN { printf \"%.1f MB\", $file_size / 1048576 }")"
+    elif [ "$file_size" -ge 1024 ]; then
+        size_human="$(awk "BEGIN { printf \"%.1f KB\", $file_size / 1024 }")"
+    else
+        size_human="${file_size} B"
+    fi
+    # Show path relative to HOME
+    rel_path="${file_path/#$HOME/\~}"
+    echo "📁 $rel_path ($size_human)"
+else
+    echo "📁 $out_dir/ ($file_ext)"
+fi
@@ -0,0 +1,86 @@
+#!/usr/bin/env bash
+set -euo pipefail
+# POS: media yt-mp3 — Download audio as MP3 (yt-dlp)
+# POS_FLAGS: --output --no-playlist --cookies --by-artist --dry-run
+
+source "$(dirname "$0")/../lib/common.sh" 2>/dev/null || source "$(dirname "$0")/common.sh"
+source "$(dirname "$0")/../lib/yt-lib.sh" 2>/dev/null || source "$(dirname "$0")/yt-lib.sh"
+
+# --dry-run is parsed before the deps guards (below): it previews the yt-dlp
+# command without requiring yt-dlp/ffmpeg to be installed.
+DRY_RUN=0
+for arg in "$@"; do
+    [ "$arg" = "--dry-run" ] && DRY_RUN=1
+done
+
+# Deps guards sit before -h|--help (help also errors on a box missing the deps).
+# yt_check_deps with dry-run=1 skips the dep checks (dry-run preview needs none).
+yt_check_deps "$DRY_RUN" "MP3 conversion"
+
+# Env seam: YT_OUT_DIR overrides the default (keeps HOME sandbox-compatible).
+OUT_DIR="${YT_OUT_DIR:-$HOME/Music}"
+BY_ARTIST=0
+EXTRA_ARGS=()
+
+usage() {
+    cat <<EOF
+Usage: pos media yt mp3 [options] <url>
+
+Download audio from a URL and convert to MP3 via yt-dlp.
+
+Options:
+  -o, --output <dir>    Output directory (default: $OUT_DIR)
+  --by-artist           Organize as <dir>/<artist>/<title>.mp3
+  --no-playlist         Download only the single video
+  --cookies <file>      Netscape cookies.txt for age-gated content
+  --dry-run             Print the yt-dlp command without running it
+  -h, --help            This help
+
+Examples:
+  pos media yt mp3 https://youtube.com/watch?v=dQw4w9WgXcQ
+  pos media yt mp3 --by-artist --no-playlist https://youtu.be/dQw4w9WgXcQ
+  pos media yt mp3 --cookies ~/cookies.txt https://vimeo.com/123
+EOF
+    exit 0
+}
+
+URL=""
+while [[ $# -gt 0 ]]; do
+    case "$1" in
+        -h|--help) usage ;;
+        -o|--output)
+            [ $# -ge 2 ] || err "--output needs a value"
+            OUT_DIR="$2"; shift 2 ;;
+        --by-artist) BY_ARTIST=1; shift ;;
+        --no-playlist) EXTRA_ARGS+=(--no-playlist); shift ;;
+        --cookies)
+            [ $# -ge 2 ] || err "--cookies needs a value"
+            [ -f "$2" ] || err "cookies file not found: $2"
+            EXTRA_ARGS+=(--cookies "$2"); shift 2 ;;
+        --dry-run) DRY_RUN=1; shift ;;
+        -*) err "Unknown option: $1 (see --help)" ;;
+        *)
+            [ -z "$URL" ] && URL="$1" && shift || err "Unexpected argument: $1" ;;
+    esac
+done
+[ -n "$URL" ] || usage
+
+if [ "$BY_ARTIST" -eq 1 ]; then
+    OUT_TEMPLATE="$OUT_DIR/%(artist,uploader)s/%(title)s.%(ext)s"
+else
+    OUT_TEMPLATE="$OUT_DIR/%(title)s.%(ext)s"
+fi
+
+args=(yt-dlp -x --audio-format mp3 --audio-quality 0
+    --embed-metadata --embed-chapters
+    --embed-thumbnail --convert-thumbnails jpg
+    --parse-metadata "%(artist,uploader)s:%(artist)s"
+    --no-overwrites
+    -o "$OUT_TEMPLATE"
+    "${EXTRA_ARGS[@]}" "$URL")
+
+if [ "$DRY_RUN" -eq 1 ]; then
+    echo "yt-dlp ${args[*]:1}"
+else
+    spawn "downloading audio → $OUT_DIR" "${args[@]}"
+fi
@@ -0,0 +1,132 @@
+#!/usr/bin/env bash
+set -euo pipefail
+# POS: media yt-mp4 — Download video as MP4 (smart/interactive format select)
+# POS_FLAGS: --format --best --worst --output --no-playlist --cookies --dry-run
+
+source "$(dirname "$0")/../lib/common.sh" 2>/dev/null || source "$(dirname "$0")/common.sh"
+source "$(dirname "$0")/../lib/yt-lib.sh" 2>/dev/null || source "$(dirname "$0")/yt-lib.sh"
+
+# --dry-run is parsed before the deps guards (below): it previews the yt-dlp
+# command without requiring yt-dlp/ffmpeg to be installed.
+DRY_RUN=0
+for arg in "$@"; do
+    [ "$arg" = "--dry-run" ] && DRY_RUN=1
+done
+
+# Deps guards sit before -h|--help (help also errors on a box missing the deps).
+# yt_check_deps with dry-run=1 skips the dep checks (dry-run preview needs none).
+yt_check_deps "$DRY_RUN" "MP4 merge"
+
+# Env seam: YT_OUT_DIR overrides the default (keeps HOME sandbox-compatible).
+OUT_DIR="${YT_OUT_DIR:-$HOME/Videos}"
+FORMAT=""
+BEST=0
+WORST=0
+EXTRA_ARGS=()
+
+usage() {
+    cat <<EOF
+Usage: pos media yt mp4 [options] <url>
+
+Download video from a URL via yt-dlp. Without -f/--best/--worst, formats are
+listed and picked interactively.
+
+Options:
+  -f, --format <id>     Download that format id directly (no prompt)
+  --best                Best video + audio (no prompt)
+  --worst               Lowest quality (no prompt)
+  -o, --output <dir>    Output directory (default: $OUT_DIR)
+  --no-playlist         Download only the single video
+  --cookies <file>      Netscape cookies.txt for age-gated content
+  --dry-run             Print the yt-dlp command without running it
+  -h, --help            This help
+
+Examples:
+  pos media yt mp4 https://youtube.com/watch?v=dQw4w9WgXcQ
+  pos media yt mp4 --best https://youtube.com/watch?v=dQw4w9WgXcQ
+  pos media yt mp4 -f 22 https://youtube.com/watch?v=dQw4w9WgXcQ
+EOF
+    exit 0
+}
+
+URL=""
+while [[ $# -gt 0 ]]; do
+    case "$1" in
+        -h|--help) usage ;;
+        -f|--format)
+            [ $# -ge 2 ] || err "--format needs a value"
+            FORMAT="$2"; shift 2 ;;
+        --best) BEST=1; shift ;;
+        --worst) WORST=1; shift ;;
+        -o|--output)
+            [ $# -ge 2 ] || err "--output needs a value"
+            OUT_DIR="$2"; shift 2 ;;
+        --no-playlist) EXTRA_ARGS+=(--no-playlist); shift ;;
+        --cookies)
+            [ $# -ge 2 ] || err "--cookies needs a value"
+            [ -f "$2" ] || err "cookies file not found: $2"
+            EXTRA_ARGS+=(--cookies "$2"); shift 2 ;;
+        --dry-run) DRY_RUN=1; shift ;;
+        -*) err "Unknown option: $1 (see --help)" ;;
+        *)
+            [ -z "$URL" ] && URL="$1" && shift || err "Unexpected argument: $1" ;;
+    esac
+done
+[ -n "$URL" ] || usage
+
+[ -n "$FORMAT" ] && { [ "$BEST" -eq 1 ] || [ "$WORST" -eq 1 ]; } \
+    && err "--format and --best/--worst are mutually exclusive"
+[ "$BEST" -eq 1 ] && [ "$WORST" -eq 1 ] && err "--best and --worst are mutually exclusive"
+
+# Resolve the format selector: explicit flag → smart preset → interactive.
+# The curated table goes to stderr; stdout carries ONLY the chosen format id
+# (same ui_pick lesson — a $(...) capture must not swallow the menu).
+fmt_spec=""
+if [ -n "$FORMAT" ]; then
+    fmt_spec="$FORMAT"
+elif [ "$BEST" -eq 1 ]; then
+    fmt_spec="bestvideo*+bestaudio/best"
+elif [ "$WORST" -eq 1 ]; then
+    fmt_spec="worst"
+else
+    table="$(yt-dlp -F "$URL" 2>&1)" || {
+        echo "ERROR: no formats listed (unsupported site or age-gated content)" >&2
+        exit 1
+    }
+    printf '%s' "$table" | awk -F'[[:space:]][[:space:]]+' '
+        NR <= 2 { print; next }
+        $0 ~ /^-+$/ { print; next }
+        $0 ~ /audio only/ && $0 !~ /storyboard/ && $1 !~ /^sb/ { print "  [audio] " $0; next }
+        $0 ~ /video only/ && $1 !~ /^sb/ { print "  [video] " $0; next }
+        $1 ~ /^[0-9]+$/ && $2 ~ /^(mp4|webm)$/ && $3 ~ /x/ { print "  [combo] " $0 }
+    ' >&2
+    echo >&2
+    read -rp "Format ID ('best'/'worst'/empty = best): " chosen
+    case "${chosen:-best}" in
+        best) fmt_spec="bestvideo*+bestaudio/best" ;;
+        worst) fmt_spec="worst" ;;
+        *)
+            if printf '%s' "$table" | grep -qE "^[[:space:]]*${chosen}[[:space:]]"; then
+                fmt_spec="$chosen"
+            else
+                echo "ERROR: unknown format id '$chosen'" >&2
+                exit 1
+            fi
+            ;;
+    esac
+fi
+
+args=(yt-dlp -f "$fmt_spec"
+    --merge-output-format mp4
+    --embed-metadata --embed-chapters
+    --embed-subs --sub-langs all
+    --embed-thumbnail
+    --no-overwrites
+    -o "$OUT_DIR/%(title)s.%(ext)s"
+    "${EXTRA_ARGS[@]}" "$URL")
+
+if [ "$DRY_RUN" -eq 1 ]; then
+    echo "yt-dlp ${args[*]:1}"
+else
+    spawn "downloading video → $OUT_DIR" "${args[@]}"
+fi
@@ -0,0 +1,169 @@
+#!/usr/bin/env bash
+set -euo pipefail
+# POS: media yt-subtitles — Extract subtitles/captions from a URL (yt-dlp)
+# POS_FLAGS: --lang --format --auto-only --output --list-subs --no-playlist --dry-run
+
+source "$(dirname "$0")/../lib/common.sh" 2>/dev/null || source "$(dirname "$0")/common.sh"
+source "$(dirname "$0")/../lib/yt-lib.sh" 2>/dev/null || source "$(dirname "$0")/yt-lib.sh"
+
+# --dry-run / --list-subs are parsed before the deps guards (below): dry-run
+# previews the yt-dlp command without requiring yt-dlp to be installed.
+DRY_RUN=0
+LIST_SUBS=0
+for arg in "$@"; do
+    [ "$arg" = "--dry-run" ] && DRY_RUN=1
+    [ "$arg" = "--list-subs" ] && LIST_SUBS=1
+done
+
+# Deps guards sit before -h|--help. Subtitles needs only yt-dlp (no ffmpeg).
+# dry-run skips the deps check entirely (preview needs no binary).
+if [ "$DRY_RUN" -eq 0 ]; then
+    command -v yt-dlp &>/dev/null || err "yt-dlp not found — install it with: sudo apt install yt-dlp"
+fi
+
+LANG_SPEC=""
+FMT="srt"
+AUTO_ONLY=0
+OUT_DIR=""
+NO_PLAYLIST=0
+
+usage() {
+    cat <<EOF
+Usage: pos media yt subtitles [options] <url>
+
+Extract subtitles/captions from a URL via yt-dlp. Fetches manual captions and
+auto-generated captions by default.
+
+Options:
+  --lang <list>         Subtitle languages (comma-separated), default: best
+  --format <fmt>        Output format: srt (default), vtt, or txt
+  --auto-only           Only auto-generated captions (no manual subs)
+  -o, --output <dir>    Output directory (default: current directory)
+  --list-subs           List available subtitles and exit (probe only)
+  --no-playlist         Download only the single video
+  --dry-run             Print the yt-dlp command without running it
+  -h, --help            This help
+
+Examples:
+  pos media yt subtitles https://youtube.com/watch?v=dQw4w9WgXcQ
+  pos media yt subtitles --lang en,ar https://youtube.com/watch?v=dQw4w9WgXcQ
+  pos media yt subtitles --format txt https://youtu.be/dQw4w9WgXcQ
+  pos media yt subtitles --list-subs https://youtube.com/watch?v=dQw4w9WgXcQ
+EOF
+    exit 0
+}
+
+# convert_srt_to_txt <srt-file> — strip SRT timestamps, seq numbers, HTML tags
+convert_srt_to_txt() {
+    local srt_file="$1" txt_file="${1%.srt}.txt"
+    sed '/^[0-9][0-9]:[0-9][0-9]/d; /^$/d; s/<[^>]*>//g' "$srt_file" > "$txt_file"
+}
+
+URL=""
+while [[ $# -gt 0 ]]; do
+    case "$1" in
+        -h|--help) usage ;;
+        --lang)
+            [ $# -ge 2 ] || err "--lang needs a value"
+            LANG_SPEC="$2"; shift 2 ;;
+        --format)
+            [ $# -ge 2 ] || err "--format needs a value"
+            case "$2" in
+                srt|vtt|txt) FMT="$2" ;;
+                *) err "unknown format '$2' (use srt, vtt, or txt)" ;;
+            esac
+            shift 2 ;;
+        --auto-only) AUTO_ONLY=1; shift ;;
+        -o|--output)
+            [ $# -ge 2 ] || err "--output needs a value"
+            OUT_DIR="$2"; shift 2 ;;
+        --list-subs) LIST_SUBS=1; shift ;;
+        --no-playlist) NO_PLAYLIST=1; shift ;;
+        --dry-run) DRY_RUN=1; shift ;;
+        -*) err "Unknown option: $1 (see --help)" ;;
+        *)
+            [ -z "$URL" ] && URL="$1" && shift || err "Unexpected argument: $1" ;;
+    esac
+done
+[ -n "$URL" ] || err "missing URL (see --help)"
+
+yt_validate_url "$URL" 2>/dev/null || err "not a valid URL: $URL (must start with http:// or https://)"
+
+# ── Build the yt-dlp command ─────────────────────────────────
+if [ "$LIST_SUBS" -eq 1 ]; then
+    args=(yt-dlp --list-subs "$URL")
+    if [ "$DRY_RUN" -eq 1 ]; then
+        yt_echo_cmd "${args[@]:1}"
+        exit 0
+    fi
+    spawn "listing subtitles" "${args[@]}"
+    exit 0
+fi
+
+# Output template
+OUT_TEMPLATE=""
+if [ -n "$OUT_DIR" ]; then
+    OUT_TEMPLATE="$OUT_DIR/%(title)s.%(sub_lang)s.%(ext)s"
+else
+    OUT_TEMPLATE="./%(title)s.%(sub_lang)s.%(ext)s"
+fi
+
+args=(yt-dlp)
+if [ "$AUTO_ONLY" -eq 1 ]; then
+    args+=(--write-auto-subs)
+else
+    args+=(--write-subs --write-auto-subs)
+fi
+
+if [ -n "$LANG_SPEC" ]; then
+    args+=(--sub-langs "$LANG_SPEC")
+else
+    args+=(--sub-langs best)
+fi
+
+case "$FMT" in
+    vtt) args+=(--sub-format vtt) ;;
+    txt) args+=(--sub-format srt) ;;
+    *)   args+=(--sub-format srt) ;;
+esac
+
+[ "$NO_PLAYLIST" -eq 1 ] && args+=(--no-playlist)
+
+args+=(-o "$OUT_TEMPLATE" "$URL")
+
+if [ "$DRY_RUN" -eq 1 ]; then
+    yt_echo_cmd "${args[@]:1}"
+    exit 0
+fi
+
+# ── Execute ───────────────────────────────────────────────────
+set +e
+out="$(mktemp)"
+err_tmp="$(mktemp)"
+"${args[@]}" >"$out" 2>"$err_tmp"
+rc=$?
+set -e
+
+if [ "$rc" -ne 0 ]; then
+    # Unavailable-subtitle detection: exit!=0 AND stderr matches no-subs patterns
+    if grep -qiE 'no subtitles|no captions|unable to extract|subtitles not available' "$err_tmp"; then
+        rm -f "$out" "$err_tmp"
+        err "unavailable subtitles for this video (try --list-subs to check)"
+    fi
+    # Re-surface the real yt-dlp error otherwise
+    sed 's/^/    /' "$err_tmp" >&2
+    rm -f "$out" "$err_tmp"
+    exit "$rc"
+fi
+rm -f "$out" "$err_tmp"
+
+# ── Post-conversion for txt format ────────────────────────────
+if [ "$FMT" = "txt" ]; then
+    search_dir="."
+    [ -n "$OUT_DIR" ] && search_dir="$OUT_DIR"
+    while IFS= read -r -d '' f; do
+        case "$f" in
+            *.srt) convert_srt_to_txt "$f" ;;
+        esac
+    done < <(find "$search_dir" -maxdepth 1 -name '*.srt' -print0 2>/dev/null || true)
+fi
@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+set -euo pipefail
+# POS: media yt-ytsync — Incrementally sync YouTube channels/playlists into ~/Videos
+# -h|--help forwarded via exec below
+exec pos media ytsync "$@"
@@ -0,0 +1,647 @@
+#!/usr/bin/env bash
+set -euo pipefail
+# POS: system bank — Persistent command bank for saving and running shell commands
+# POS_SUBCMDS: list add show run edit remove alias
+
+source "$(dirname "$0")/../lib/common.sh" 2>/dev/null || source "$(dirname "$0")/common.sh"
+source "$(dirname "$0")/../lib/menu-lib.sh" 2>/dev/null || source "$(dirname "$0")/menu-lib.sh"
+source "$(dirname "$0")/../lib/bank-lib.sh" 2>/dev/null || source "$(dirname "$0")/bank-lib.sh"
+
+usage() {
+    cat <<'EOF'
+Usage: pos system bank [subcommand] [args]
+
+Persistent command bank for saving and running shell commands.
+
+Subcommands:
+  list                  List all saved commands
+  add <name> [desc] [cmd]  Add a new command (interactive if args missing)
+  show <name>           Show command details
+  run <name> [key=val ...] Run a command (interactive for missing params)
+  edit <name>           Edit an existing command
+  remove <name>         Remove a command
+  alias <name> [alias_name]  Create/update a bash alias for a bank command
+  alias list            List bash aliases in ~/.bashrc
+  alias remove <alias_name>  Remove a bash alias
+
+Interactive menu:
+  pos system bank              (no args on a terminal)
+
+Examples:
+  pos system bank add disk-info "Disk usage" "df -h && du -sh /mnt/12T"
+  pos system bank run disk-info
+  pos system bank run convert-video input=/path/to/video.mp4 quality=23 output=/path/out.mp4
+EOF
+    exit 0
+}
+
+case "${1:-}" in
+    -h|--help) usage ;;
+esac
+
+# ── Interactive command picker ───────────────────────────────────
+_pick_command() {
+    bank_load
+    local count="${#BANK_NAMES[@]}"
+    if [ "$count" -eq 0 ]; then
+        warn "Command bank is empty — add one with: pos system bank add <name> \"desc\" \"cmd\""
+        return 1
+    fi
+    local -a items=()
+    local i
+    for ((i = 0; i < count; i++)); do
+        if [ -n "${BANK_DESCS[$i]}" ]; then
+            items+=("${BANK_NAMES[$i]} — ${BANK_DESCS[$i]}")
+        else
+            items+=("${BANK_NAMES[$i]}")
+        fi
+    done
+    local choice
+    choice="$(menu_pick "Pick command" "${items[@]}")" || return 1
+    echo "${BANK_NAMES[$((choice - 1))]}"
+}
+
+# ── cmd_list ─────────────────────────────────────────────────────
+cmd_list() {
+    bank_load
+    local count="${#BANK_NAMES[@]}"
+    if [ "$count" -eq 0 ]; then
+        log "Command bank is empty — add one with: pos system bank add <name> \"desc\" \"cmd\""
+        return 0
+    fi
+    echo
+    echo "COMMAND BANK"
+    echo
+    local i
+    for ((i = 0; i < count; i++)); do
+        if [ -n "${BANK_DESCS[$i]}" ]; then
+            printf '  %-25s %s\n' "${BANK_NAMES[$i]}" "${BANK_DESCS[$i]}"
+        else
+            printf '  %s\n' "${BANK_NAMES[$i]}"
+        fi
+    done
+    echo
+}
+
+# ── cmd_add ──────────────────────────────────────────────────────
+cmd_add() {
+    local name="" desc="" cmd=""
+    case $# in
+        0) ;;
+        1) name="$1" ;;
+        2) name="$1"; desc="$2" ;;
+        *) name="$1"; desc="$2"; cmd="$3" ;;
+    esac
+    if [ -z "$name" ]; then
+        name="$(menu_ask_value "Name")" || return 0
+    fi
+    if [ -z "$desc" ]; then
+        desc="$(menu_ask_value "Description" "")" || return 0
+    fi
+    if [ -z "$cmd" ]; then
+        cmd="$(menu_read_value "Command")" || return 0
+    fi
+    bank_valid_name "$name" || err "Invalid name: $name (use letters, numbers, hyphens, underscores)"
+    [ -n "$cmd" ] || err "Command cannot be empty"
+    bank_load
+    local i
+    for ((i = 0; i < ${#BANK_NAMES[@]}; i++)); do
+        [[ "${BANK_NAMES[$i]}" == "$name" ]] && err "Command '$name' already exists (use 'pos system bank edit' to modify)"
+    done
+    bank_add "$name" "$desc" "$cmd"
+    ok "Saved: $name"
+}
+
+# ── cmd_show ─────────────────────────────────────────────────────
+cmd_show() {
+    [ -n "${1:-}" ] || err "Usage: pos system bank show <name>"
+    local name="$1"
+    bank_load
+    bank_find "$name" >/dev/null 2>&1 || err "Command not found: $name"
+    local cmd_name cmd_desc cmd_cmd
+    cmd_name="${BANK_NAMES[$BANK_IDX]}"
+    cmd_desc="${BANK_DESCS[$BANK_IDX]}"
+    cmd_cmd="${BANK_CMDS[$BANK_IDX]}"
+    echo
+    echo "Name: $cmd_name"
+    echo
+    echo "Description:"
+    if [ -n "$cmd_desc" ]; then
+        echo "$cmd_desc"
+    else
+        echo "  (none)"
+    fi
+    echo
+    echo "Command:"
+    echo
+    echo "$cmd_cmd"
+    local params
+    params="$(_extract_params "$cmd_cmd")"
+    if [ -n "$params" ]; then
+        echo
+        echo "Parameters:"
+        echo "$params" | while IFS= read -r p; do
+            echo "  $p"
+        done
+    fi
+    echo
+}
+
+# ── cmd_run ──────────────────────────────────────────────────────
+cmd_run() {
+    local name=""
+    local -a cli_params=()
+    if [ $# -eq 0 ]; then
+        name="$(_pick_command)" || return 0
+    else
+        name="$1"; shift
+        while [ $# -gt 0 ]; do
+            case "$1" in
+                *=*) cli_params+=("$1") ;;
+                *) err "Invalid parameter format: $1 (expected key=value)" ;;
+            esac
+            shift
+        done
+    fi
+    bank_load
+    bank_find "$name" >/dev/null 2>&1 || err "Command not found: $name"
+    local cmd_name cmd_desc cmd_cmd
+    cmd_name="${BANK_NAMES[$BANK_IDX]}"
+    cmd_desc="${BANK_DESCS[$BANK_IDX]}"
+    cmd_cmd="${BANK_CMDS[$BANK_IDX]}"
+    # Detect parameters
+    local params_str
+    params_str="$(_extract_params "$cmd_cmd")"
+    local -a params=()
+    if [ -n "$params_str" ]; then
+        while IFS= read -r p; do
+            params+=("$p")
+        done <<< "$params_str"
+    fi
+    # Build parameter values from CLI args
+    local -A param_values=()
+    for p in "${cli_params[@]}"; do
+        local key="${p%%=*}" val="${p#*=}"
+        param_values["$key"]="$val"
+    done
+    # Interactively prompt for missing parameters
+    local -a missing=()
+    for p in "${params[@]}"; do
+        [[ -z "${param_values[$p]+x}" ]] && missing+=("$p")
+    done
+    if [ ${#missing[@]} -gt 0 ]; then
+        for p in "${missing[@]}"; do
+            local val
+            val="$(menu_ask_value "$p" "")" || return 0
+            param_values["$p"]="$val"
+        done
+    fi
+    # Substitute parameters
+    local final_cmd="$cmd_cmd"
+    if [ ${#params[@]} -gt 0 ]; then
+        local -a sub_args=()
+        for p in "${params[@]}"; do
+            sub_args+=("${p}=${param_values[$p]:-}")
+        done
+        final_cmd="$(_substitute_params "$cmd_cmd" "${sub_args[@]}")"
+    fi
+    echo
+    log "Running: $final_cmd"
+    echo
+    eval "$final_cmd"
+    return $?
+}
+
+# ── cmd_edit ─────────────────────────────────────────────────────
+cmd_edit() {
+    local name="${1:-}"
+    if [ -z "$name" ]; then
+        name="$(_pick_command)" || return 0
+    fi
+    bank_load
+    bank_find "$name" >/dev/null 2>&1 || err "Command not found: $name"
+    local old_name old_desc old_cmd
+    old_name="${BANK_NAMES[$BANK_IDX]}"
+    old_desc="${BANK_DESCS[$BANK_IDX]}"
+    old_cmd="${BANK_CMDS[$BANK_IDX]}"
+    echo
+    log "Editing: $old_name"
+    echo
+    local new_name new_desc new_cmd
+    new_name="$(menu_ask_value "New name" "$old_name")" || return 0
+    new_desc="$(menu_ask_value "New description" "$old_desc")" || return 0
+    new_cmd="$(menu_read_value "New command")" || return 0
+    [ -z "$new_name" ] && new_name="$old_name"
+    [ -z "$new_desc" ] && new_desc="$old_desc"
+    [ -z "$new_cmd" ] && new_cmd="$old_cmd"
+    if [ "$new_name" != "$old_name" ]; then
+        bank_valid_name "$new_name" || err "Invalid name: $new_name"
+        local i found=0
+        for ((i = 0; i < ${#BANK_NAMES[@]}; i++)); do
+            [[ "${BANK_NAMES[$i]}" == "$new_name" ]] && found=1
+        done
+        [[ "$found" -eq 1 ]] && err "A command named '$new_name' already exists"
+        bank_remove "$old_name"
+        bank_add "$new_name" "$new_desc" "$new_cmd"
+    else
+        bank_update "$new_name" "$new_desc" "$new_cmd"
+    fi
+    ok "Updated: $new_name"
+}
+
+# ── cmd_remove ───────────────────────────────────────────────────
+cmd_remove() {
+    local name="${1:-}"
+    if [ -z "$name" ]; then
+        name="$(_pick_command)" || return 0
+    fi
+    bank_load
+    bank_find "$name" >/dev/null 2>&1 || err "Command not found: $name"
+    if [ -t 0 ]; then
+        confirm "Remove '$name'?" n || { log "Cancelled"; return 0; }
+    fi
+    bank_remove "$name"
+    # Drop bash aliases pointing at the removed command (best-effort upkeep;
+    # a malformed block is a warning, never a remove blocker).
+    if [ -f "$BASH_RC_FILE" ] && grep -qF "$ALIAS_START" "$BASH_RC_FILE"; then
+        if alias_block_parse; then
+            local -a keep=() i
+            local removed_alias=0
+            for ((i = 0; i < ${#ALIAS_NAMES[@]}; i++)); do
+                if [[ "${ALIAS_TARGETS[${ALIAS_NAMES[$i]}]:-}" == "$name" ]]; then
+                    removed_alias=1
+                else
+                    keep+=("${ALIAS_NAMES[$i]}")
+                fi
+            done
+            if [ "$removed_alias" -eq 1 ]; then
+                ALIAS_NAMES=("${keep[@]}")
+                alias_block_write
+                log "Removed alias pointing to '$name' from $BASH_RC_FILE"
+            fi
+        else
+            local rc=$?
+            [ "$rc" -eq 2 ] && warn "Alias block in $BASH_RC_FILE is malformed — left untouched"
+        fi
+    fi
+    ok "Removed: $name"
+}
+
+# ── Alias management ─────────────────────────────────────────────
+# Bash aliases for bank commands live in a single managed block inside
+# $BASH_RC_FILE (~/.bashrc by default), so they survive rebuilds and are easy
+# to see/undo by hand. Every line has the exact shape:
+#   alias <alias_name>='pos system bank run <bank_name>'
+# The block is written atomically (tmp + mv, preserving file permissions).
+ALIAS_START='# >>> pos bank aliases (managed by pos system bank — do not hand-edit) <<<'
+ALIAS_END='# <<< pos bank aliases (managed by pos system bank) <<<'
+BASH_RC_FILE="${BASH_RC_FILE:-$HOME/.bashrc}"
+
+# Valid bash alias names we manage: letters/digits/_/- (same rule as bank names).
+alias_valid_name() {
+    [[ "$1" =~ ^[a-zA-Z][a-zA-Z0-9_-]*$ ]]
+}
+
+# Parse the managed block from $BASH_RC_FILE into:
+#   ALIAS_NAMES   — ordered array of alias names (file order, unique)
+#   ALIAS_TARGETS — assoc: alias_name → bank command name
+# Returns: 0 = healthy block present, 1 = no block, 2 = malformed block.
+alias_block_parse() {
+    declare -g -a ALIAS_NAMES
+    declare -g -A ALIAS_TARGETS
+    ALIAS_NAMES=()
+    ALIAS_TARGETS=()
+    [ -f "$BASH_RC_FILE" ] || return 1
+    local line in_block=0 starts=0 ends=0 rc=0
+    while IFS= read -r line; do
+        if [ "$in_block" -eq 0 ]; then
+            if [[ "$line" == "$ALIAS_START" ]]; then
+                in_block=1
+                starts=$((starts + 1))
+                [ "$starts" -gt 1 ] && rc=2
+            elif [[ "$line" == "$ALIAS_END" ]]; then
+                rc=2
+            fi
+        elif [[ "$line" == "$ALIAS_END" ]]; then
+            in_block=0
+            ends=$((ends + 1))
+        elif [[ "$line" =~ ^alias[[:space:]]+([a-zA-Z][a-zA-Z0-9_-]*)= ]]; then
+            # NOTE: no `'` inside the =~ regex (bash treats quotes there as
+            # quoting operators and would literalize the ( ) groups) — the
+            # quoted payload is matched with a glob `case` instead.
+            local a="${BASH_REMATCH[1]}"
+            local payload="${line#*=}"
+            case "$payload" in
+                "'pos system bank run "[a-zA-Z][a-zA-Z0-9_-]*"'")
+                    local t="${payload%\'}"
+                    t="${t#\'pos system bank run }"
+                    if [[ " ${ALIAS_NAMES[*]:-} " == *" $a "* ]]; then
+                        rc=2
+                        continue
+                    fi
+                    ALIAS_NAMES+=("$a")
+                    ALIAS_TARGETS["$a"]="$t"
+                    ;;
+                *) rc=2 ;;
+            esac
+        else
+            rc=2
+        fi
+    done < "$BASH_RC_FILE"
+    [ "$in_block" -eq 1 ] && rc=2
+    [ "$rc" -eq 0 ] && [ "$starts" -eq 0 ] && return 1
+    return "$rc"
+}
+
+# Require a healthy managed block (alias commands err on missing/malformed).
+alias_block_require() {
+    local rc
+    if alias_block_parse; then
+        return 0
+    else
+        rc=$?
+    fi
+    if [ "$rc" -eq 1 ]; then
+        err "No alias block in $BASH_RC_FILE — add one with: pos system bank alias <name>"
+    fi
+    err "Alias block in $BASH_RC_FILE is malformed (markers or lines were hand-edited) — fix it manually, then retry"
+}
+
+# Scan for an alias NAME defined OUTSIDE the managed block (a collision we
+# refuse to overwrite). Prints the offending line; rc 0 = found, 1 = clean.
+alias_collision() {
+    local name="$1"
+    [ -f "$BASH_RC_FILE" ] || return 1
+    local line in_block=0
+    while IFS= read -r line; do
+        if [ "$in_block" -eq 0 ] && [[ "$line" == "$ALIAS_START" ]]; then
+            in_block=1
+            continue
+        fi
+        if [ "$in_block" -eq 1 ] && [[ "$line" == "$ALIAS_END" ]]; then
+            in_block=0
+            continue
+        fi
+        if [ "$in_block" -eq 0 ] && [[ "$line" =~ ^[[:space:]]*alias[[:space:]]+$name= ]]; then
+            printf '%s\n' "$line"
+            return 0
+        fi
+    done < "$BASH_RC_FILE"
+    return 1
+}
+
+# Rewrite $BASH_RC_FILE from ALIAS_NAMES + ALIAS_TARGETS. Callers guarantee the
+# file is absent or has at most one healthy block. Removes the block entirely
+# when ALIAS_NAMES is empty; appends a fresh block when none exists yet.
+alias_block_write() {
+    local content="" start_line=0 end_line=0 n=0 line
+    local pre="" post="" dir perms tmp new_content=""
+    if [ -f "$BASH_RC_FILE" ]; then
+        content="$(< "$BASH_RC_FILE")"
+        perms="$(stat -c %a "$BASH_RC_FILE" 2>/dev/null || printf '600')"
+        while IFS= read -r line; do
+            n=$((n + 1))
+            if [ "$start_line" -eq 0 ] && [[ "$line" == "$ALIAS_START" ]]; then
+                start_line=$n
+            elif [ "$start_line" -gt 0 ] && [ "$end_line" -eq 0 ] && [[ "$line" == "$ALIAS_END" ]]; then
+                end_line=$n
+            fi
+        done <<< "$content"
+        if [ "$start_line" -gt 0 ] && [ "$end_line" -eq 0 ]; then
+            err "Alias block in $BASH_RC_FILE has no end marker — fix it manually, then retry"
+        fi
+    else
+        perms=600
+    fi
+    # No block and nothing to manage → never touch the file (nor create it).
+    if [ "$start_line" -eq 0 ] && [ "${#ALIAS_NAMES[@]}" -eq 0 ]; then
+        return 0
+    fi
+    if [ "$start_line" -gt 0 ]; then
+        # NOTE: sed "1,0p" is NOT empty in GNU sed (0 is a last-line sentinel,
+        # it prints line 1) — guard the ranges so edge blocks rewrite cleanly.
+        if [ "$start_line" -gt 1 ]; then
+            pre="$(printf '%s\n' "$content" | sed -n "1,$((start_line - 1))p")"
+        fi
+        if [ "$end_line" -lt "$n" ]; then
+            post="$(printf '%s\n' "$content" | sed -n "$((end_line + 1)),\$p")"
+        fi
+    else
+        pre="$(printf '%s\n' "$content")"
+    fi
+    if [ -n "$pre" ]; then
+        new_content+="$pre"
+        case "$new_content" in
+            *$'\n') ;;
+            *) new_content+=$'\n' ;;
+        esac
+    fi
+    if [ "${#ALIAS_NAMES[@]}" -gt 0 ]; then
+        new_content+="$ALIAS_START"$'\n'
+        local i
+        for ((i = 0; i < ${#ALIAS_NAMES[@]}; i++)); do
+            new_content+="alias ${ALIAS_NAMES[$i]}='pos system bank run ${ALIAS_TARGETS[${ALIAS_NAMES[$i]}]:-}'"$'\n'
+        done
+        new_content+="$ALIAS_END"$'\n'
+    fi
+    if [ -n "$post" ]; then
+        new_content+="$post"
+        case "$new_content" in
+            *$'\n') ;;
+            *) new_content+=$'\n' ;;
+        esac
+    fi
+    dir="$(dirname "$BASH_RC_FILE")"
+    mkdir -p "$dir" || err "Cannot create directory: $dir"
+    tmp="$(mktemp "${dir}/.pos-bank-aliases.XXXXXX")" || err "Cannot create temp file in $dir"
+    printf '%s' "$new_content" > "$tmp"
+    chmod "$perms" "$tmp"
+    mv "$tmp" "$BASH_RC_FILE"
+}
+
+# ── cmd_alias ────────────────────────────────────────────────────
+cmd_alias() {
+    case "${1:-}" in
+        list)   shift; cmd_alias_list "$@" ;;
+        remove) shift; cmd_alias_remove "$@" ;;
+        "")     err "Usage: pos system bank alias <name> [alias_name] | list | remove <alias_name>" ;;
+        *)      cmd_alias_add "$@" ;;
+    esac
+}
+
+cmd_alias_add() {
+    local name="${1:-}" alias_name="${2:-$1}"
+    [ -n "$name" ] || err "Usage: pos system bank alias <name> [alias_name]"
+    bank_valid_name "$name" || err "Invalid command name: $name"
+    alias_valid_name "$alias_name" || err "Invalid alias name: $alias_name (use letters, numbers, hyphens, underscores)"
+    bank_load
+    bank_find "$name" >/dev/null 2>&1 || err "Command not found: $name"
+    local rc
+    if alias_block_parse; then
+        rc=0
+    else
+        rc=$?
+    fi
+    [ "$rc" -eq 2 ] && err "Alias block in $BASH_RC_FILE is malformed (hand-edited?) — fix it manually, then retry"
+    if [ -f "$BASH_RC_FILE" ] && hit="$(alias_collision "$alias_name")"; then
+        err "Alias '$alias_name' is already defined outside the managed block in $BASH_RC_FILE: $hit"
+    fi
+    if command -v "$alias_name" >/dev/null 2>&1; then
+        warn "Note: '$alias_name' is also a command on PATH — the alias will shadow it in interactive shells"
+    fi
+    local found=0 i
+    for ((i = 0; i < ${#ALIAS_NAMES[@]}; i++)); do
+        [[ "${ALIAS_NAMES[$i]}" == "$alias_name" ]] && found=1
+    done
+    [ "$found" -eq 0 ] && ALIAS_NAMES+=("$alias_name")
+    ALIAS_TARGETS["$alias_name"]="$name"
+    alias_block_write
+    ok "Alias '$alias_name' → pos system bank run $name (in $BASH_RC_FILE)"
+    log "Run: source $BASH_RC_FILE  (or open a new shell)"
+}
+
+cmd_alias_list() {
+    alias_block_require
+    if [ "${#ALIAS_NAMES[@]}" -eq 0 ]; then
+        log "No aliases in $BASH_RC_FILE — add one with: pos system bank alias <name>"
+        return 0
+    fi
+    echo
+    echo "BANK ALIASES (in $BASH_RC_FILE)"
+    echo
+    local i
+    for ((i = 0; i < ${#ALIAS_NAMES[@]}; i++)); do
+        printf '  %-25s → pos system bank run %s\n' "${ALIAS_NAMES[$i]}" "${ALIAS_TARGETS[${ALIAS_NAMES[$i]}]:-}"
+    done
+    echo
+}
+
+# ── Interactive alias picker ─────────────────────────────────────
+_pick_alias() {
+    local rc
+    if alias_block_parse; then
+        rc=0
+    else
+        rc=$?
+    fi
+    [ "$rc" -eq 2 ] && err "Alias block in $BASH_RC_FILE is malformed — fix it manually"
+    [ "$rc" -eq 1 ] && err "No alias block in $BASH_RC_FILE — add one with: pos system bank alias <name>"
+    if [ "${#ALIAS_NAMES[@]}" -eq 0 ]; then
+        warn "No aliases yet — add one first"
+        return 1
+    fi
+    local -a items=()
+    local i
+    for ((i = 0; i < ${#ALIAS_NAMES[@]}; i++)); do
+        items+=("${ALIAS_NAMES[$i]} → pos system bank run ${ALIAS_TARGETS[${ALIAS_NAMES[$i]}]:-}")
+    done
+    local choice
+    choice="$(menu_pick "Pick alias" "${items[@]}")" || return 1
+    echo "${ALIAS_NAMES[$((choice - 1))]}"
+}
+
+cmd_alias_remove() {
+    local alias_name="${1:-}"
+    if [ -z "$alias_name" ]; then
+        if [ -t 0 ]; then
+            alias_name="$(_pick_alias)" || return 0
+        else
+            err "Usage: pos system bank alias remove <alias_name>"
+        fi
+    fi
+    alias_block_require
+    local found=0 i
+    for ((i = 0; i < ${#ALIAS_NAMES[@]}; i++)); do
+        [[ "${ALIAS_NAMES[$i]}" == "$alias_name" ]] && found=1
+    done
+    [ "$found" -eq 1 ] || err "Alias '$alias_name' not found (see: pos system bank alias list)"
+    if [ -t 0 ]; then
+        confirm "Remove alias '$alias_name'?" n || { log "Cancelled"; return 0; }
+    fi
+    local -a keep=()
+    for ((i = 0; i < ${#ALIAS_NAMES[@]}; i++)); do
+        [[ "${ALIAS_NAMES[$i]}" != "$alias_name" ]] && keep+=("${ALIAS_NAMES[$i]}")
+    done
+    ALIAS_NAMES=("${keep[@]}")
+    unset "ALIAS_TARGETS[$alias_name]"
+    alias_block_write
+    ok "Removed alias '$alias_name' from $BASH_RC_FILE"
+    log "Run: source $BASH_RC_FILE  (or open a new shell)"
+}
+
+alias_menu() {
+    while true; do
+        local choice
+        choice="$(menu_run "Bank Aliases" \
+            "List aliases" \
+            "Add alias" \
+            "Remove alias")" || return 0
+        case "$choice" in
+            1) cmd_alias_list ;;
+            2)
+                local name alias_name
+                name="$(_pick_command)" || return 0
+                alias_name="$(menu_ask_value "Alias name" "$name")" || return 0
+                [ -z "$alias_name" ] && alias_name="$name"
+                cmd_alias_add "$name" "$alias_name"
+                ;;
+            3)
+                local alias_name
+                alias_name="$(_pick_alias)" || return 0
+                cmd_alias_remove "$alias_name"
+                ;;
+        esac
+    done
+}
+
+# ── Interactive menu ─────────────────────────────────────────────
+run_menu() {
+    menu_guard || exit 1
+    while true; do
+        local choice
+        choice="$(menu_run "Command Bank" \
+            "List commands" \
+            "Add command" \
+            "Run command" \
+            "Edit command" \
+            "Remove command" \
+            "Manage aliases")" || return 0
+        case "$choice" in
+            1) cmd_list ;;
+            2) cmd_add ;;
+            3) cmd_run ;;
+            4) cmd_edit ;;
+            5) cmd_remove ;;
+            6) alias_menu ;;
+        esac
+    done
+}
+
+# ── Dispatch ─────────────────────────────────────────────────────
+if [ "${1:-}" = "menu" ]; then
+    run_menu
+    exit 0
+fi
+
+for arg in "$@"; do
+    case "$arg" in
+        -h|--help) usage ;;
+    esac
+done
+
+if [ $# -eq 0 ] && [ -t 0 ]; then
+    run_menu
+    exit 0
+fi
+
+case "${1:-}" in
+    list)   shift; cmd_list "$@" ;;
+    add)    shift; cmd_add "$@" ;;
+    show)   shift; cmd_show "$@" ;;
+    run)    shift; cmd_run "$@" ;;
+    edit)   shift; cmd_edit "$@" ;;
+    remove) shift; cmd_remove "$@" ;;
+    alias)  shift; cmd_alias "$@" ;;
+    "")     usage ;;
+    *)      err "Unknown subcommand: $1 (see --help)" ;;
+esac
@@ -55,7 +55,8 @@ done
 # ── pos-owned installed files (single source of truth, mirrors install.sh) ──
 # lib/*.sh list shipped by install.sh phase 2 to /usr/local/bin.
 POS_LIBS=(common.sh flags.sh notify.sh entertainment-lib.sh scheduler-lib.sh config-ui.sh \
-    user-timers-lib.sh entertainment-plugin-lib.sh usb-lib.sh share-lib.sh menu-lib.sh registry.sh)
+    user-timers-lib.sh entertainment-plugin-lib.sh usb-lib.sh share-lib.sh menu-lib.sh registry.sh \
+    yt-lib.sh bank-lib.sh)
 # Exact lines postinstall.sh appends to ~/.bashrc.
 PATH_LINE='export PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:$HOME/.local/bin:$PATH"'
 COMPLETION_LINE='source /usr/local/share/bash-completion/completions/pos.bash 2>/dev/null || true'
@@ -11,10 +11,11 @@ _pos_flags[communication-telegram-sender]="--type --caption --parse-mode --no-pr
 _pos_flags[docker-stack]="-a --all"
 _pos_flags[docker-vbox]="--dir --gpu --device --port --cpus --memory --network"
 _pos_flags[entertainment-send]="--print --markdown"
-_pos_flags[media-grab]="--audio --video --best --worst --output --no-playlist --cookies --dry-run"
-_pos_flags[media-mp3]="--output --no-playlist --cookies --by-artist --dry-run"
-_pos_flags[media-mp4]="--format --best --worst --output --no-playlist --cookies --dry-run"
 _pos_flags[media-sync]="--mp3 --mp4 --source --dry-run"
+_pos_flags[media-yt-grab]="--audio --video --best --worst --output --no-playlist --cookies --dry-run"
+_pos_flags[media-yt-mp3]="--output --no-playlist --cookies --by-artist --dry-run"
+_pos_flags[media-yt-mp4]="--format --best --worst --output --no-playlist --cookies --dry-run"
+_pos_flags[media-yt-subtitles]="--lang --format --auto-only --output --list-subs --no-playlist --dry-run"
 _pos_flags[media-ytsync]="--dry-run"
 _pos_flags[network-checkport]="--tcp --udp --ping --no-banner --versions --timeout"
 _pos_flags[network-download]="--dir --out --split --seed --force --upload --gid --tmux"
@@ -42,12 +43,14 @@ _pos_subcmds[docker-compose]="ls installed up down restart logs update config me
 _pos_subcmds[docker-vbox]="create enter stop start rm ls menu"
 _pos_subcmds[media-sync]="menu"
 _pos_subcmds[media-ytsync]="add sync list remove"
+_pos_subcmds[media-yt]="mp3 mp4 grab ytsync subtitles"
 _pos_subcmds[network-download]="start stop status add torrent metalink list info files peers pause resume remove purge move limit set watch restart retry replace menu"
 _pos_subcmds[share-nfs-client]="mount unmount list persist unpersist menu"
 _pos_subcmds[share-nfs-server]="status share unshare list reload enable disable menu"
 _pos_subcmds[share-smb-client]="mount unmount list persist unpersist menu"
 _pos_subcmds[share-smb-server]="status share unshare list adduser deluser reload enable disable menu"
 _pos_subcmds[system-backup]="menu"
+_pos_subcmds[system-bank]="list add show run edit remove alias"
 _pos_subcmds[system-schedule]="run list config enable disable status migrate menu"
 _pos_subcmds[ai]="ask chat sessions capture models providers llamacpp alias gemini hf openrouter server"
 # GEN:END possubcmds
@@ -111,7 +114,14 @@ _pos() {

    # ── Helpers ────────────────────────────────────────────────
    _pos_complete_categories() {
-        COMPREPLY=($(compgen -W "${!cat_cmds[*]} config" -- "$cur"))
+        local solos=()
+        for cmd in "${all_cmds[@]}"; do
+            local cat_c="${cmd%%-*}"
+            if [ "$cat_c" = "$cmd" ] && [ -z "${cat_cmds[$cmd]:-}" ]; then
+                solos+=("$cmd")
+            fi
+        done
+        COMPREPLY=($(compgen -W "${!cat_cmds[*]} ${solos[*]}" -- "$cur"))
    }

    _pos_complete_subcats() {
@@ -227,7 +237,13 @@ _pos() {
        3)
            case "${words[1]}" in
                config) _pos_config_scopes ;;
-                *) _pos_complete_subcats ;;
+                *)
+                    if [[ "${words[1]}" == *-* ]]; then
+                        _pos_complete_subcats
+                    else
+                        _pos_complete_tool "${words[1]}"
+                    fi
+                    ;;
            esac
            ;;
        4)
@@ -14,11 +14,26 @@ fi
 source "$(dirname "$0")/lib/common.sh"
 source "$(dirname "$0")/lib/flags.sh"

+# Return the current install.sh version (e.g. "0.0c174").
+# Derived from git commit count. Empty when .git is absent.
+# Override with INSTALL_VERSION_OVERRIDE for testing.
+install_version() {
+    if [ "${INSTALL_VERSION_OVERRIDE+x}" ]; then
+        printf '%s' "$INSTALL_VERSION_OVERRIDE"
+        return
+    fi
+    local repo_dir count
+    repo_dir="$(cd "$(dirname "$0")" && pwd)"
+    count="$(git -C "$repo_dir" rev-list --count HEAD 2>/dev/null)" || { printf ''; return; }
+    printf '0.0c%s' "$count"
+}
+
 # Exported so child phases (preinstall.sh, postinstall.sh) inherit it —
 # otherwise '--dry-run' silently executes them for real.
 export DRY_RUN=0
 RUN_APPS=0
 RUN_FEATURES=0
+FORCE=0
 SKIP_PHASES=""
 STEPS_SPEC=""

@@ -58,6 +73,7 @@ Options:
  --full            Core install + all optional apps (non-interactive)
  --feature         Install features/ scripts (prompts before overwriting)
  --dry-run         Show what would be done without executing
+  --force           Re-install even if the version matches
  --skip <phase>    Skip a phase (repeatable):
                      preinstall, scripts, postinstall, scalepoint, apps
  --steps <spec>    Run only specific phases. Format: 1,3,4 or 1-3
@@ -79,6 +95,7 @@ while [[ $# -gt 0 ]]; do
        --full) RUN_APPS=2; shift ;;
        --feature) RUN_FEATURES=1; shift ;;
        --dry-run) DRY_RUN=1; shift ;;
+        --force) FORCE=1; shift ;;
        --skip)
            [ -z "${2:-}" ] && err "Missing value for --skip"
            SKIP_PHASES="${SKIP_PHASES:+$SKIP_PHASES,}$2"
@@ -95,6 +112,24 @@ while [[ $# -gt 0 ]]; do
    esac
 done

+# ── Version gate ────────────────────────────────────────────────
+CURRENT_VERSION="$(install_version)"
+if [ "${FORCE:-0}" -ne 1 ] && [ -n "$CURRENT_VERSION" ]; then
+    INSTALLED_VERSION="$(flag_value installed_version 2>/dev/null)" || true
+    if [ -n "$INSTALLED_VERSION" ]; then
+        current_num="${CURRENT_VERSION#0.0c}"
+        installed_num="${INSTALLED_VERSION#0.0c}"
+        if [ "$current_num" -eq "$installed_num" ] 2>/dev/null; then
+            if [ "${DRY_RUN:-0}" -eq 1 ]; then
+                log "(dry-run) Would skip install: already at version $CURRENT_VERSION"
+            else
+                log "Already installed ($CURRENT_VERSION). Use --force to re-install."
+            fi
+            exit 0
+        fi
+    fi
+fi
+
 # ── Phase runner ────────────────────────────────────────────────
 # Phase names → numbers:  preinstall=1 scripts=2 postinstall=3 scalepoint=4
 should_run() {
@@ -140,7 +175,7 @@ if should_run 2 scripts; then
    done
    lib_count=0
    lib_names=""
-    for lf in common.sh flags.sh notify.sh entertainment-lib.sh scheduler-lib.sh config-ui.sh user-timers-lib.sh entertainment-plugin-lib.sh usb-lib.sh share-lib.sh menu-lib.sh registry.sh; do
+    for lf in common.sh flags.sh notify.sh entertainment-lib.sh scheduler-lib.sh config-ui.sh user-timers-lib.sh entertainment-plugin-lib.sh usb-lib.sh share-lib.sh menu-lib.sh registry.sh yt-lib.sh bank-lib.sh; do
        run sudo install -m 644 "lib/$lf" "/usr/local/bin/$lf"
        lib_count=$((lib_count + 1))
        lib_names+="$lf "
@@ -248,6 +283,11 @@ echo "${GREEN}══════════════════════
 echo "${GREEN}  Bootstrap complete ($(timer_stop))${RESET}"
 echo "${GREEN}════════════════════════════════════════════${RESET}"

+# ── Record installed version ────────────────────────────────────
+if [ "${DRY_RUN:-0}" -ne 1 ] && [ -n "${CURRENT_VERSION:-}" ]; then
+    flag_set installed_version "$CURRENT_VERSION"
+fi
+
 # ── Optional apps ──────────────────────────────────────────────
 if [ "$RUN_APPS" -eq 1 ]; then
    echo
@@ -0,0 +1,183 @@
+#!/usr/bin/env bash
+# lib/bank-lib.sh — shared storage helpers for the Command Bank.
+# Sourced by bin/pos-system-bank. Uses err() from lib/common.sh.
+#
+# Storage: ~/.config/linux_post_install/bank.env
+# Format:  name|description|command
+# v2: commands with real newlines are saved with \\ (backslash) and \n
+#     (newline) escapes; files written by v1 have no marker and load raw.
+#
+# Contracts:
+#   * Defines ONLY bank_* functions — sourcing never clobbers a tool's helpers.
+#   * Requires common.sh to be sourced by the CALLER.
+#   * NEVER exits — return codes only.
+#   * Performs NO interactive prompts (those stay in bin/pos-system-bank).
+
+CONFIG_DIR="${CONFIG_DIR:-${XDG_CONFIG_HOME:-$HOME/.config}/linux_post_install}"
+BANK_FILE="${BANK_FILE:-${CONFIG_DIR}/bank.env}"
+
+# ── Load ────────────────────────────────────────────────────────
+# Populate parallel arrays: BANK_NAMES, BANK_DESCS, BANK_CMDS.
+bank_load() {
+    BANK_NAMES=(); BANK_DESCS=(); BANK_CMDS=()
+    [ -f "$BANK_FILE" ] || return 0
+
+    local line name desc cmd v2=0
+    while IFS= read -r line; do
+        [[ "$line" =~ ^[[:space:]]*# ]] && { [[ "$line" == *"BANK_VERSION: 2"* ]] && v2=1; continue; }
+        [[ -z "${line// /}" ]] && continue
+        IFS='|' read -r name desc cmd <<< "$line"
+        [[ -z "$name" ]] && continue
+        [ "$v2" -eq 1 ] && cmd="$(printf '%b' "$cmd")"
+        BANK_NAMES+=("$name")
+        BANK_DESCS+=("${desc:-}")
+        BANK_CMDS+=("${cmd:-}")
+    done < "$BANK_FILE"
+}
+
+# ── Save ────────────────────────────────────────────────────────
+# Atomic overwrite from parallel arrays.
+bank_save() {
+    local dir
+    dir="$(dirname "$BANK_FILE")"
+    mkdir -p "$dir"
+    local tmp
+    tmp="$(mktemp "${dir}/.bank.XXXXXX")"
+    {
+        printf '%s\n' "# Command Bank — managed by pos bank (do not hand-edit)"
+        printf '%s\n' "# Format: name|description|command (\\n = escaped newline in command)"
+        printf '%s\n' "# BANK_VERSION: 2"
+        local i
+        for ((i = 0; i < ${#BANK_NAMES[@]}; i++)); do
+            local cmd="${BANK_CMDS[$i]}"
+            # Escape: every backslash → \\, every real newline → \n (keeps one record per physical line)
+            cmd="${cmd//\\/\\\\}"
+            cmd="${cmd//$'\n'/\\n}"
+            printf '%s|%s|%s\n' "${BANK_NAMES[$i]}" "${BANK_DESCS[$i]}" "$cmd"
+        done
+    } > "$tmp"
+    chmod 600 "$tmp"
+    mv "$tmp" "$BANK_FILE"
+}
+
+# ── Add ─────────────────────────────────────────────────────────
+bank_add() {
+    local name="$1" desc="$2" cmd="$3"
+    bank_load
+    local i
+    for ((i = 0; i < ${#BANK_NAMES[@]}; i++)); do
+        [[ "${BANK_NAMES[$i]}" == "$name" ]] && return 1
+    done
+    BANK_NAMES+=("$name")
+    BANK_DESCS+=("$desc")
+    BANK_CMDS+=("$cmd")
+    bank_save
+}
+
+# ── Remove ──────────────────────────────────────────────────────
+bank_remove() {
+    local name="$1"
+    bank_load
+    local found=0 i
+    for ((i = 0; i < ${#BANK_NAMES[@]}; i++)); do
+        if [[ "${BANK_NAMES[$i]}" == "$name" ]]; then
+            unset 'BANK_NAMES[i]'
+            unset 'BANK_DESCS[i]'
+            unset 'BANK_CMDS[i]'
+            found=1
+            break
+        fi
+    done
+    [[ "$found" -eq 1 ]] || return 1
+    # Re-index arrays (unset leaves gaps)
+    BANK_NAMES=("${BANK_NAMES[@]}")
+    BANK_DESCS=("${BANK_DESCS[@]}")
+    BANK_CMDS=("${BANK_CMDS[@]}")
+    bank_save
+}
+
+# ── Update ──────────────────────────────────────────────────────
+bank_update() {
+    local name="$1" desc="$2" cmd="$3"
+    bank_load
+    local i
+    for ((i = 0; i < ${#BANK_NAMES[@]}; i++)); do
+        if [[ "${BANK_NAMES[$i]}" == "$name" ]]; then
+            BANK_DESCS[$i]="$desc"
+            BANK_CMDS[$i]="$cmd"
+            bank_save
+            return 0
+        fi
+    done
+    return 1
+}
+
+# ── Find (by name) ──────────────────────────────────────────────
+# Sets BANK_IDX. Returns 0 if found, 1 if not.
+bank_find() {
+    local name="$1"
+    bank_load
+    local i
+    for ((i = 0; i < ${#BANK_NAMES[@]}; i++)); do
+        if [[ "${BANK_NAMES[$i]}" == "$name" ]]; then
+            BANK_IDX=$i
+            return 0
+        fi
+    done
+    return 1
+}
+
+# ── Get (by name) ───────────────────────────────────────────────
+# Outputs: name\tdescription\tcommand (tab-separated).
+bank_get() {
+    local name="$1"
+    bank_find "$name" || return 1
+    printf '%s\t%s\t%s\n' "${BANK_NAMES[$BANK_IDX]}" "${BANK_DESCS[$BANK_IDX]}" "${BANK_CMDS[$BANK_IDX]}"
+}
+
+# ── List names ──────────────────────────────────────────────────
+bank_list_names() {
+    bank_load
+    local i
+    for ((i = 0; i < ${#BANK_NAMES[@]}; i++)); do
+        printf '%s\n' "${BANK_NAMES[$i]}"
+    done
+}
+
+# ── Count ───────────────────────────────────────────────────────
+bank_count() {
+    bank_load
+    echo "${#BANK_NAMES[@]}"
+}
+
+# ── Validate name ───────────────────────────────────────────────
+bank_valid_name() {
+    [[ "$1" =~ ^[a-zA-Z][a-zA-Z0-9_-]*$ ]]
+}
+
+# ── Extract {param} names from a command template ───────────────
+_extract_params() {
+    local cmd="$1"
+    grep -oE '\{[a-zA-Z_][a-zA-Z0-9_]*\}' <<< "$cmd" 2>/dev/null | \
+        sed 's/[{}]//g' | \
+        awk '!seen[$0]++' || true
+}
+
+# ── Substitute {param} with quoted values ───────────────────────
+# Usage: _substitute_params "cmd template" "key1=val1" "key2=val2" ...
+# Uses awk to build quoted replacements safely, avoiding bash quote-nesting.
+_substitute_params() {
+    local cmd="$1"; shift
+    # Build a sed expression: for each key=val, replace {key} with "val"
+    local sed_expr=""
+    while [ $# -gt 0 ]; do
+        local key="${1%%=*}"
+        local val="${1#*=}"
+        # Escape sed special chars in the value
+        val="${val//\\/\\\\}"
+        val="${val//\//\\/}"
+        sed_expr+="s/{${key}}/\"${val}\"/g; "
+        shift
+    done
+    [ -n "$sed_expr" ] && printf '%s' "$cmd" | sed "$sed_expr" || printf '%s' "$cmd"
+}
@@ -0,0 +1,50 @@
+# lib/yt-lib.sh — shared helpers for yt-dlp-based media tools.
+# Sourced opt-in by yt-* subcommand files. Uses err() from lib/common.sh.
+
+# yt_check_deps [dry_run] [ffmpeg_purpose]
+# Check yt-dlp (+ ffmpeg unless dry_run=1 and caller wants dry-run to skip deps).
+# ffmpeg_purpose is the parenthetical in the error message (default: "MP3 conversion").
+# ytsync overrides this deliberately (needs yt-dlp+jq even in dry-run).
+yt_check_deps() {
+    local dry="${1:-0}" purpose="${2:-MP3 conversion}"
+    command -v yt-dlp &>/dev/null || err "yt-dlp not found — install it with: sudo apt install yt-dlp"
+    if [ "$dry" -eq 0 ]; then
+        command -v ffmpeg &>/dev/null || err "ffmpeg not found (needed for $purpose) — install it with: sudo apt install ffmpeg"
+    fi
+}
+
+# yt_validate_url <url>
+# Returns 1 (does NOT exit) when URL doesn't start with http:// or https://;
+# prints the diagnostic to stderr. Callers surface the error themselves (e.g.
+# `yt_validate_url "$url" 2>/dev/null || err "…"` with their own prefix) so a
+# helper whose only job is to check can never kill the caller's error path.
+yt_validate_url() {
+    local url="$1"
+    case "$url" in
+        http://*|https://*) return 0 ;;
+        *) echo "not a valid URL: $url (must start with http:// or https://)" >&2; return 1 ;;
+    esac
+}
+
+# yt_echo_cmd <args...>
+# Prints the yt-dlp command for --dry-run mode
+yt_echo_cmd() {
+    echo "yt-dlp $*"
+}
+
+# classify_url <url>
+# Domain classification: music.youtube/soundcloud/bandcamp → audio;
+# youtube/youtu.be/vimeo/twitch → video; unknown → ${GRAB_DEFAULT:-video}
+# Migrated from bin/pos-media-grab
+classify_url() {
+    local url="$1" mode="${GRAB_DEFAULT:-video}"
+    case "$url" in
+        *music.youtube.com*)  echo "audio" ;;
+        *soundcloud.com*)     echo "audio" ;;
+        *bandcamp.com*)       echo "audio" ;;
+        *youtube.com*|*youtu.be*) echo "video" ;;
+        *vimeo.com*)          echo "video" ;;
+        *twitch.tv*)          echo "video" ;;
+        *)                    echo "$mode" ;;
+    esac
+}
@@ -0,0 +1,22 @@
+# Decision: lib-registration standard is a 3-surface symmetry (install.sh + POS_LIBS + docs)
+
+## Finding (2026-09-12, MAINTENANCE_COMPLETE)
+
+lib/bank-lib.sh (added 41efc91 feat: pos bank) was never registered in install.sh's
+phase-2 lib copy list, bin/pos-system-uninstall's POS_LIBS, or the hand-maintained docs.
+lib/yt-lib.sh had been added to install.sh (0b76d4d) but missed POS_LIBS. Result: after
+`./install.sh`, `pos bank` failed with `/usr/local/bin/bank-lib.sh: No such file or directory`,
+and uninstall would leave stale yt-lib.sh. The symmetry gate tests/t-uninstall-manifest.sh
+(set-equality of the two lists) was failing.
+
+## Established standard (restored)
+
+Every lib/ file sourced by a bin/ tool MUST be registered in all THREE places:
+1. install.sh phase-2 lib copy loop (`for lf in …; do`) → ships to /usr/local/bin,
+2. bin/pos-system-uninstall `POS_LIBS` array (same set, backslash-continuation style),
+3. hand-maintained docs: DOC/SCRIPTS.md phase-2 table row + DOC/AGENT_Context_Project.md
+   phase-2 lib list AND its hand-maintained filetable row (above GEN:START filetable,
+   with real `wc -l` count).
+
+Validator: tests/t-uninstall-manifest.sh (must stay green; it enforces set equality and
+that every listed lib exists). Never edit GEN:START/GEN:END blocks by hand — run make gen.
@@ -156,6 +156,11 @@ if [ -d systemd ] && [ -n "$(ls -A systemd/*.service 2>/dev/null)" ]; then
            warn "usb-automount feature not installed — skipping usb-automount.service (run ./install.sh --feature)"
            continue
        fi
+        # ssh-agent.service — gated on ssh-agent flag
+        if [ "$svc_name" = "ssh-agent.service" ] && ! flag_is_set ssh-agent; then
+            warn "ssh-agent feature not installed — skipping ssh-agent.service (run ./install.sh --feature)"
+            continue
+        fi
        run sudo systemctl enable --now "$svc_name" 2>/dev/null || \
            run sudo systemctl enable "$svc_name"
        log "service enabled: $svc_name"
@@ -53,4 +53,9 @@ silently.
 | `t-uninstall-manifest.sh` | install.sh ↔ POS_LIBS symmetry, user-unit discovery, marker-driven plugin removal |
 | `t-gen-docs-drift.sh` | `make gen` idempotence on a pristine tracked tree (CI drift gate) |
 | `t-lint-gate.sh` | `make lint` green on the real tree; planted violations are caught and named |
-| `t-share-mountpoint.sh` | share-client `ask_mountpoint` UX: existing/new/declined/rejected paths, confirm gate, mkdir side effects, non-TTY stdin contract, static `n`→`t` guards |
+| `t-install-version.sh` | install.sh version gate: match→skip, mismatch→proceed, --force bypass, dry-run variant, flag write, numeric comparison |
+| `t-share-mountpoint.sh` | share-client `ask_mountpoint` UX: existing/new/declined/rejected paths, confirm gate, mkdir side effects, non-TTY stdin contract, static `n`→`t` guards |
+| `t-pos-media-yt.sh` | unified `pos media yt` suite: dispatcher + forwarder resolution, shared yt-lib helpers, yt-mp3/mp4/grab/subtitles flags, dry-run deps, `YT_OUT_DIR` seam, `GRAB_DEFAULT` config, negative controls (unsafe-URL no-expansion, `--lang en,ar` single arg, txt timestamp-stripping) |
+| `t-telegram-listener-singleton.sh` | Telegram listener single-instance guard: first `--run` acquires the flock, second `--run` fails fast with the exact message, lock auto-releases so the next start is clean, `--status` reports the lock state |
+| `t-telegram-listener-reap.sh` | Telegram listener crash-loop regression: non-zero (254) child exit no longer kills the daemon, reply carries the real exit code + output, negative control proves the old `wait`-under-`set -e` idiom dies, getUpdates offset persists across restarts (resume, invalid-state fallback, empty-batch no-write) |
+| `t-bank.sh` | Command Bank: bank-lib.sh unit tests (add/remove/update/find/get/list/count/valid/extract_params/substitute_params, multiline `\n` storage round-trip, literal-`\n` escape round-trip, v1 backward compat) + pos system bank CLI integration (help, list, add, show, run, remove, params, invalid name, multiline show/run) + `alias` subcommand (managed `~/.bashrc` block, exact line format, idempotent create, retarget, list, remove, block cleaned when empty, outer collision refused w/ file untouched, PATH-shadow warn, invalid alias name, unknown command, `bank remove` drops aliases, unrelated bashrc content preserved byte-identically, malformed block, empty-block message) |
@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+# tests/bank-test-helper.sh — minimal shim that sources bank-lib.sh for unit
+# testing.  Provides a stub `err()` so bank-lib.sh can load without the full
+# common.sh / menu-lib.sh dependency chain.
+set -euo pipefail
+
+# Stub err() — bank-lib.sh is contractually "never exits" but bank_valid_name
+# callers sometimes chain via `|| err …`.  This version returns 1 so the test
+# harness can assert rc.
+err() { printf 'ERROR: %s\n' "$*" >&2; return 1; }
+
+# Source the library under test.
+source "$ROOT/lib/bank-lib.sh"
@@ -0,0 +1,653 @@
+#!/usr/bin/env bash
+set -euo pipefail
+# t-bank.sh — Command Bank feature: bank-lib.sh unit tests + pos system bank CLI
+# integration tests.
+#
+# Storage contract: pipe-delimited name|description|command in $BANK_FILE.
+# Parameter syntax: {param} placeholders in command templates.
+
+run_test() {
+    local sandbox helper
+    sandbox="$(mksandbox bank)"
+    helper="$sandbox/helper.sh"
+
+    # ── Build a sourced helper that gives us bank-lib functions ──
+    cat > "$helper" <<'HELPER'
+source "$ROOT/tests/bank-test-helper.sh"
+HELPER
+
+    # ═══════════════════════════════════════════════════════════════
+    # Part A: bank-lib.sh unit tests
+    # ═══════════════════════════════════════════════════════════════
+
+    # A1: bank_add + bank_load — add two entries, verify arrays
+    (
+        BANK_FILE="$sandbox/a1.bank.env"
+        : > "$BANK_FILE"
+        source "$helper"
+        bank_add "deploy" "Deploy to prod" "ssh prod 'cd /app && git pull'"
+        bank_add "backup" "Backup database" "pg_dump mydb | gzip > /tmp/db.sql.gz"
+        bank_load
+        # Check arrays
+        [ "${#BANK_NAMES[@]}" -eq 2 ] || { echo "FAIL A1: expected 2 names, got ${#BANK_NAMES[@]}"; exit 1; }
+        [ "${BANK_NAMES[0]}" = "deploy" ] || { echo "FAIL A1: name[0] mismatch"; exit 1; }
+        [ "${BANK_DESCS[0]}" = "Deploy to prod" ] || { echo "FAIL A1: desc[0] mismatch"; exit 1; }
+        [ "${BANK_CMDS[1]}" = "pg_dump mydb | gzip > /tmp/db.sql.gz" ] || { echo "FAIL A1: cmd[1] mismatch"; exit 1; }
+        echo "PASS A1: bank_add + bank_load populates arrays correctly"
+    ) && printf '  PASS  bank_add + bank_load populates arrays\n' \
+      || printf '  FAIL  bank_add + bank_load populates arrays\n'
+
+    # A2: bank_add duplicate — returns rc 1
+    (
+        BANK_FILE="$sandbox/a2.bank.env"
+        printf 'old|Old cmd|echo old\n' > "$BANK_FILE"
+        source "$helper"
+        bank_add "old" "New desc" "echo new"
+        exit $?
+    )
+    check_rc "bank_add duplicate returns rc 1" 1 $?
+
+    # A3: bank_remove — remove entry, verify gone
+    (
+        BANK_FILE="$sandbox/a3.bank.env"
+        printf 'aaa|desc a|cmd a\nbbb|desc b|cmd b\nccc|desc c|cmd c\n' > "$BANK_FILE"
+        source "$helper"
+        bank_remove "bbb"
+        bank_load
+        [ "${#BANK_NAMES[@]}" -eq 2 ] || { echo "FAIL A3: expected 2, got ${#BANK_NAMES[@]}"; exit 1; }
+        [ "${BANK_NAMES[0]}" = "aaa" ] || { echo "FAIL A3: name[0] mismatch"; exit 1; }
+        [ "${BANK_NAMES[1]}" = "ccc" ] || { echo "FAIL A3: name[1] mismatch"; exit 1; }
+        # Verify file on disk
+        grep -q '^bbb|' "$BANK_FILE" && { echo "FAIL A3: bbb still in file"; exit 1; }
+        echo "PASS A3: bank_remove"
+    ) && printf '  PASS  bank_remove removes entry\n' \
+      || printf '  FAIL  bank_remove removes entry\n'
+
+    # A4: bank_remove missing — returns rc 1
+    (
+        BANK_FILE="$sandbox/a4.bank.env"
+        printf 'xxx|desc|cmd\n' > "$BANK_FILE"
+        source "$helper"
+        bank_remove "nonexistent"
+        exit $?
+    )
+    check_rc "bank_remove missing returns rc 1" 1 $?
+
+    # A5: bank_update — update entry, verify changed
+    (
+        BANK_FILE="$sandbox/a5.bank.env"
+        printf 'mycmd|old desc|old cmd\n' > "$BANK_FILE"
+        source "$helper"
+        bank_update "mycmd" "new desc" "new cmd"
+        bank_load
+        [ "${BANK_DESCS[0]}" = "new desc" ] || { echo "FAIL A5: desc mismatch"; exit 1; }
+        [ "${BANK_CMDS[0]}" = "new cmd" ] || { echo "FAIL A5: cmd mismatch"; exit 1; }
+        # Verify on disk
+        grep -q 'new desc|new cmd' "$BANK_FILE" || { echo "FAIL A5: not persisted"; exit 1; }
+        echo "PASS A5: bank_update"
+    ) && printf '  PASS  bank_update updates entry\n' \
+      || printf '  FAIL  bank_update updates entry\n'
+
+    # A6: bank_update missing — returns rc 1
+    (
+        BANK_FILE="$sandbox/a6.bank.env"
+        printf 'exists|desc|cmd\n' > "$BANK_FILE"
+        source "$helper"
+        bank_update "nope" "desc" "cmd"
+        exit $?
+    )
+    check_rc "bank_update missing returns rc 1" 1 $?
+
+    # A7: bank_find — found sets BANK_IDX, not-found returns 1
+    (
+        BANK_FILE="$sandbox/a7.bank.env"
+        printf 'alpha|d1|c1\nbeta|d2|c2\ngamma|d3|c3\n' > "$BANK_FILE"
+        source "$helper"
+        bank_find "beta"
+        [ "${BANK_IDX:-}" = "1" ] || { echo "FAIL A7: expected BANK_IDX=1, got ${BANK_IDX:-unset}"; exit 1; }
+        bank_find "nonexistent" && { echo "FAIL A7: should return 1 for missing"; exit 1; }
+        echo "PASS A7: bank_find"
+    ) && printf '  PASS  bank_find sets BANK_IDX / returns 1\n' \
+      || printf '  FAIL  bank_find sets BANK_IDX / returns 1\n'
+
+    # A8: bank_get — returns tab-separated output
+    (
+        BANK_FILE="$sandbox/a8.bank.env"
+        printf 'mytool|My Tool|echo hello\n' > "$BANK_FILE"
+        source "$helper"
+        local out
+        out="$(bank_get "mytool")"
+        [ "$out" = "mytool	My Tool	echo hello" ] || { echo "FAIL A8: unexpected output [$out]"; exit 1; }
+        echo "PASS A8: bank_get"
+    ) && printf '  PASS  bank_get returns tab-separated output\n' \
+      || printf '  FAIL  bank_get returns tab-separated output\n'
+
+    # A9: bank_list_names — lists all names
+    (
+        BANK_FILE="$sandbox/a9.bank.env"
+        printf 'one|x|y\ntwo|a|b\nthree|c|d\n' > "$BANK_FILE"
+        source "$helper"
+        local names
+        names="$(bank_list_names)"
+        local expected
+        expected="$(printf 'one\ntwo\nthree')"
+        [ "$names" = "$expected" ] || { echo "FAIL A9: expected [$expected] got [$names]"; exit 1; }
+        echo "PASS A9: bank_list_names"
+    ) && printf '  PASS  bank_list_names lists all names\n' \
+      || printf '  FAIL  bank_list_names lists all names\n'
+
+    # A10: bank_count — returns correct count
+    (
+        BANK_FILE="$sandbox/a10.bank.env"
+        printf 'a|1|2\nb|3|4\nc|5|6\nd|7|8\n' > "$BANK_FILE"
+        source "$helper"
+        local cnt
+        cnt="$(bank_count)"
+        [ "$cnt" -eq 4 ] || { echo "FAIL A10: expected 4, got $cnt"; exit 1; }
+        echo "PASS A10: bank_count"
+    ) && printf '  PASS  bank_count returns correct count\n' \
+      || printf '  FAIL  bank_count returns correct count\n'
+
+    # A11: bank_count — empty file returns 0
+    (
+        BANK_FILE="$sandbox/a11.bank.env"
+        : > "$BANK_FILE"
+        source "$helper"
+        local cnt
+        cnt="$(bank_count)"
+        [ "$cnt" -eq 0 ] || { echo "FAIL A11: expected 0, got $cnt"; exit 1; }
+        echo "PASS A11: bank_count empty"
+    ) && printf '  PASS  bank_count returns 0 for empty file\n' \
+      || printf '  FAIL  bank_count returns 0 for empty file\n'
+
+    # A12: bank_valid_name — valid names pass
+    (
+        source "$helper"
+        local fail=0
+        for n in "deploy" "my-cmd" "test_123" "A" "z9"; do
+            bank_valid_name "$n" || { fail=1; printf 'FAIL A12: %s should be valid\n' "$n" >&2; }
+        done
+        [ "$fail" -eq 0 ] || exit 1
+        echo "PASS A12: bank_valid_name accepts valid names"
+    ) && printf '  PASS  bank_valid_name accepts valid names\n' \
+      || printf '  FAIL  bank_valid_name accepts valid names\n'
+
+    # A13: bank_valid_name — invalid names fail
+    (
+        source "$helper"
+        local fail=0
+        for n in "" "1abc" "-start" "_under" "has space" "special!"; do
+            bank_valid_name "$n" && { fail=1; printf 'FAIL A13: %s should be invalid\n' "$n" >&2; }
+        done
+        [ "$fail" -eq 0 ] || exit 1
+        echo "PASS A13: bank_valid_name rejects invalid names"
+    ) && printf '  PASS  bank_valid_name rejects invalid names\n' \
+      || printf '  FAIL  bank_valid_name rejects invalid names\n'
+
+    # A14: _extract_params — extracts {param} names from template
+    (
+        source "$helper"
+        local params
+        params="$(_extract_params "echo {name} {path}")"
+        local expected
+        expected="$(printf 'name\npath')"
+        [ "$params" = "$expected" ] || { echo "FAIL A14: expected [$expected] got [$params]"; exit 1; }
+        echo "PASS A14: _extract_params"
+    ) && printf '  PASS  _extract_params extracts param names\n' \
+      || printf '  FAIL  _extract_params extracts param names\n'
+
+    # A15: _extract_params — no params returns empty
+    (
+        source "$helper"
+        local params
+        params="$(_extract_params "echo hello world")"
+        [ -z "$params" ] || { echo "FAIL A15: expected empty, got [$params]"; exit 1; }
+        echo "PASS A15: _extract_params empty"
+    ) && printf '  PASS  _extract_params returns empty for no params\n' \
+      || printf '  FAIL  _extract_params returns empty for no params\n'
+
+    # A16: _extract_params — deduplicates repeated params
+    (
+        source "$helper"
+        local params
+        params="$(_extract_params "cp {src} {dst} && ls {src}")"
+        local count
+        count="$(printf '%s' "$params" | grep -c '^src$' || true)"
+        [ "$count" -eq 1 ] || { echo "FAIL A16: expected 1 occurrence of src, got $count"; exit 1; }
+        echo "PASS A16: _extract_params deduplicates"
+    ) && printf '  PASS  _extract_params deduplicates\n' \
+      || printf '  FAIL  _extract_params deduplicates\n'
+
+    # A17: _substitute_params — replaces {param} with quoted values
+    (
+        source "$helper"
+        local result
+        result="$(_substitute_params "scp {file} user@host:{dest}" "file=/tmp/data.csv" "dest=/var/data")"
+        local expected='scp "/tmp/data.csv" user@host:"/var/data"'
+        [ "$result" = "$expected" ] || { echo "FAIL A17: expected [$expected] got [$result]"; exit 1; }
+        echo "PASS A17: _substitute_params"
+    ) && printf '  PASS  _substitute_params replaces params\n' \
+      || printf '  FAIL  _substitute_params replaces params\n'
+
+    # A18: bank_load — comments and blank lines are skipped
+    (
+        BANK_FILE="$sandbox/a18.bank.env"
+        cat > "$BANK_FILE" <<'BANK'
+# Command Bank — managed by pos system bank (do not hand-edit)
+# Format: name|description|command
+
+real|Real command|echo real
+# another comment
+
+  # indented comment
+  
+BANK
+        source "$helper"
+        bank_load
+        [ "${#BANK_NAMES[@]}" -eq 1 ] || { echo "FAIL A18: expected 1, got ${#BANK_NAMES[@]}"; exit 1; }
+        [ "${BANK_NAMES[0]}" = "real" ] || { echo "FAIL A18: name mismatch"; exit 1; }
+        echo "PASS A18: bank_load skips comments and blanks"
+    ) && printf '  PASS  bank_load skips comments and blank lines\n' \
+      || printf '  FAIL  bank_load skips comments and blank lines\n'
+
+    # A19: multiline command storage round-trip — escapes \n, single record line
+    (
+        BANK_FILE="$sandbox/a19.bank.env"
+        : > "$BANK_FILE"
+        source "$helper"
+        script="$(cat <<'SCRIPT'
+#!/usr/bin/env bash
+for tag in one two; do
+    out="$(printf '%s' "$tag" | tr 'a-z' 'A-Z')"
+    echo "tag=${tag} out=${out} done"
+done
+SCRIPT
+)"
+        bank_add "ml" "Multiline demo" "$script"
+        bank_load
+        [ "${#BANK_NAMES[@]}" -eq 1 ] || { echo "FAIL A19: expected 1 entry, got ${#BANK_NAMES[@]}"; exit 1; }
+        [ "${BANK_CMDS[0]}" = "$script" ] || { echo "FAIL A19: command bytes differ"; exit 1; }
+        rec_lines="$(grep -c '^ml|' "$BANK_FILE" || true)"
+        [ "$rec_lines" -eq 1 ] || { echo "FAIL A19: expected 1 record line, got $rec_lines"; exit 1; }
+        [ "$(wc -l < "$BANK_FILE")" -eq 4 ] || { echo "FAIL A19: file has bogus physical lines"; exit 1; }
+        grep -q '\\n' "$BANK_FILE" || { echo "FAIL A19: missing \\n escape in file"; exit 1; }
+        echo "PASS A19: multiline round-trip"
+    ) && printf '  PASS  multiline storage round-trip (one record line, \\n escapes)\n' \
+      || printf '  FAIL  multiline storage round-trip (one record line, \\n escapes)\n'
+
+    # A20: literal \n (backslash-n) in command round-trips literally — NOT a real newline
+    (
+        BANK_FILE="$sandbox/a20.bank.env"
+        : > "$BANK_FILE"
+        source "$helper"
+        esc="$(printf '%s' "printf 'a\\nb'")"
+        bank_add "esc" "Escapes" "$esc"
+        bank_load
+        [ "${BANK_CMDS[0]}" = "$esc" ] || { echo "FAIL A20: literal \\n not preserved [${BANK_CMDS[0]}]"; exit 1; }
+        case "${BANK_CMDS[0]}" in
+            *$'\n'*) echo "FAIL A20: decoded literal \\n into a real newline"; exit 1 ;;
+        esac
+        echo "PASS A20: literal \\n round-trip"
+    ) && printf '  PASS  literal \\n command round-trips literally\n' \
+      || printf '  FAIL  literal \\n command round-trips literally\n'
+
+    # A21: old-format file (no BANK_VERSION marker) keeps raw backslashes — no %b decode
+    (
+        BANK_FILE="$sandbox/a21.bank.env"
+        cat > "$BANK_FILE" <<'BANK'
+# Command Bank — managed by pos system bank (do not hand-edit)
+# Format: name|description|command
+raw|Raw echo|echo 'a\b'
+BANK
+        source "$helper"
+        bank_load
+        expected="$(printf '%s' "echo 'a\\b'")"
+        [ "${BANK_CMDS[0]}" = "$expected" ] || { echo "FAIL A21: raw backslash changed [${BANK_CMDS[0]}]"; exit 1; }
+        echo "PASS A21: old-format raw backslash"
+    ) && printf '  PASS  old-format file keeps raw backslash (no decode)\n' \
+      || printf '  FAIL  old-format file keeps raw backslash (no decode)\n'
+
+    # A22: old-format entry survives a re-save byte-identically (escape + decode round-trip)
+    (
+        BANK_FILE="$sandbox/a22.bank.env"
+        cat > "$BANK_FILE" <<'BANK'
+# Command Bank — managed by pos system bank (do not hand-edit)
+# Format: name|description|command
+ts-google|Tailscale Google|tailscale status --json >/tmp/ts.json && grep -q '"ExitNodeStatus":null' /tmp/ts.json && tailscale set --exit-node=google || tailscale set --exit-node=
+BANK
+        source "$helper"
+        bank_load
+        orig="${BANK_CMDS[0]}"
+        bank_add "new-cmd" "New entry" "echo ok"
+        bank_load
+        [ "${#BANK_NAMES[@]}" -eq 2 ] || { echo "FAIL A22: expected 2 entries, got ${#BANK_NAMES[@]}"; exit 1; }
+        [ "${BANK_CMDS[0]}" = "$orig" ] || { echo "FAIL A22: old entry changed after re-save"; exit 1; }
+        [ "${BANK_CMDS[1]}" = "echo ok" ] || { echo "FAIL A22: new entry missing"; exit 1; }
+        echo "PASS A22: old-format re-save round-trip"
+    ) && printf '  PASS  old-format entry round-trips through re-save\n' \
+      || printf '  FAIL  old-format entry round-trips through re-save\n'
+
+    # ═══════════════════════════════════════════════════════════════
+    # Part B: pos system bank CLI integration tests
+    # ═══════════════════════════════════════════════════════════════
+
+    local pos_bank="$ROOT/bin/pos-system-bank"
+
+    # B1: pos system bank --help shows usage
+    test_run env BANK_FILE="$sandbox/b1.bank.env" "$pos_bank" --help
+    check_rc "pos system bank --help exits 0" 0 "$TR_RC"
+    check_contains "pos system bank --help shows Usage" "Usage:" "$TR_OUT"
+    check_contains "pos system bank --help mentions subcommands" "Subcommands:" "$TR_OUT"
+
+    # B2: pos system bank list on empty bank shows empty message
+    : > "$sandbox/b2.bank.env"
+    test_run env BANK_FILE="$sandbox/b2.bank.env" "$pos_bank" list
+    check_rc "pos system bank list empty exits 0" 0 "$TR_RC"
+    check_contains "pos system bank list empty message" "Command bank is empty" "$TR_OUT"
+
+    # B3: pos system bank add — adds a command, verify in bank.env
+    : > "$sandbox/b3.bank.env"
+    test_run env BANK_FILE="$sandbox/b3.bank.env" "$pos_bank" add "disk-usage" "Check disk usage" "df -h"
+    check_rc "pos system bank add exits 0" 0 "$TR_RC"
+    check_contains "pos system bank add confirms" "Saved: disk-usage" "$TR_OUT"
+    # Verify the file
+    if grep -q '^disk-usage|Check disk usage|df -h$' "$sandbox/b3.bank.env"; then
+        printf '  PASS  pos system bank add persists to bank.env\n'
+    else
+        printf '  FAIL  pos system bank add did not persist to bank.env\n'
+    fi
+
+    # B4: pos system bank add duplicate — fails
+    test_run env BANK_FILE="$sandbox/b3.bank.env" "$pos_bank" add "disk-usage" "dup" "echo dup"
+    check_not_contains "pos system bank add duplicate errors" "0" "$TR_RC"
+    check_contains "pos system bank add duplicate message" "already exists" "$TR_OUT"
+
+    # B5: pos system bank show — shows command details
+    test_run env BANK_FILE="$sandbox/b3.bank.env" "$pos_bank" show "disk-usage"
+    check_rc "pos system bank show exits 0" 0 "$TR_RC"
+    check_contains "pos system bank show shows name" "Name: disk-usage" "$TR_OUT"
+    check_contains "pos system bank show shows description" "Check disk usage" "$TR_OUT"
+    check_contains "pos system bank show shows command" "df -h" "$TR_OUT"
+
+    # B6: pos system bank show missing — fails
+    test_run env BANK_FILE="$sandbox/b3.bank.env" "$pos_bank" show "nonexistent"
+    check_not_contains "pos system bank show missing exits non-zero" "0" "$TR_RC"
+    check_contains "pos system bank show missing message" "not found" "$TR_OUT"
+
+    # B7: pos system bank list after add — shows the entry
+    test_run env BANK_FILE="$sandbox/b3.bank.env" "$pos_bank" list
+    check_rc "pos system bank list populated exits 0" 0 "$TR_RC"
+    check_contains "pos system bank list shows header" "COMMAND BANK" "$TR_OUT"
+    check_contains "pos system bank list shows entry" "disk-usage" "$TR_OUT"
+
+    # B8: pos system bank remove — removes a command
+    test_run env BANK_FILE="$sandbox/b3.bank.env" "$pos_bank" remove "disk-usage"
+    check_rc "pos system bank remove exits 0" 0 "$TR_RC"
+    check_contains "pos system bank remove confirms" "Removed: disk-usage" "$TR_OUT"
+    # Verify gone
+    if grep -q '^disk-usage|' "$sandbox/b3.bank.env"; then
+        printf '  FAIL  pos system bank remove did not delete from bank.env\n'
+    else
+        printf '  PASS  pos system bank remove deletes from bank.env\n'
+    fi
+
+    # B9: pos system bank remove missing — fails
+    : > "$sandbox/b9.bank.env"
+    test_run env BANK_FILE="$sandbox/b9.bank.env" "$pos_bank" remove "ghost"
+    check_not_contains "pos system bank remove missing exits non-zero" "0" "$TR_RC"
+    check_contains "pos system bank remove missing message" "not found" "$TR_OUT"
+
+    # B10: pos system bank add with parameters — show lists them
+    : > "$sandbox/b10.bank.env"
+    test_run env BANK_FILE="$sandbox/b10.bank.env" "$pos_bank" add "convert" "Convert video" "ffmpeg -i {input} -q:v {quality} {output}"
+    check_rc "pos system bank add with params exits 0" 0 "$TR_RC"
+    test_run env BANK_FILE="$sandbox/b10.bank.env" "$pos_bank" show "convert"
+    check_contains "show lists input param" "input" "$TR_OUT"
+    check_contains "show lists quality param" "quality" "$TR_OUT"
+    check_contains "show lists output param" "output" "$TR_OUT"
+
+    # B11: pos system bank add invalid name — fails
+    : > "$sandbox/b11.bank.env"
+    test_run env BANK_FILE="$sandbox/b11.bank.env" "$pos_bank" add "1bad" "desc" "cmd"
+    check_not_contains "pos system bank add invalid name exits non-zero" "0" "$TR_RC"
+    check_contains "pos system bank add invalid name message" "Invalid name" "$TR_OUT"
+
+    # B12: pos system bank run — executes a saved command (no params)
+    # Negative control: the old `local name="" -a cli_params=()` declaration
+    # crashed at line 150 before any output (rc != 0, no "Running:" line).
+    : > "$sandbox/b12.bank.env"
+    test_run env BANK_FILE="$sandbox/b12.bank.env" "$pos_bank" add "greet" "Greet" "echo bank-run-ok"
+    check_rc "pos system bank add for run exits 0" 0 "$TR_RC"
+    test_run env BANK_FILE="$sandbox/b12.bank.env" "$pos_bank" run "greet"
+    check_rc "pos system bank run executes saved command" 0 "$TR_RC"
+    check_contains "pos system bank run logs the command" "Running: echo bank-run-ok" "$TR_OUT"
+    check_contains "pos system bank run executes output" "bank-run-ok" "$TR_OUT"
+
+    # B13: pos system bank run missing command — fails
+    test_run env BANK_FILE="$sandbox/b12.bank.env" "$pos_bank" run "ghost"
+    check_not_contains "pos system bank run missing exits non-zero" "0" "$TR_RC"
+    check_contains "pos system bank run missing message" "Command not found" "$TR_OUT"
+
+    # B14: pos system bank run with params — CLI key=val substitution, no interactive prompt
+    : > "$sandbox/b14.bank.env"
+    test_run env BANK_FILE="$sandbox/b14.bank.env" "$pos_bank" add "echo-param" "Echo param" "echo hi {who}"
+    check_rc "pos system bank add param exits 0" 0 "$TR_RC"
+    test_run env BANK_FILE="$sandbox/b14.bank.env" "$pos_bank" run "echo-param" "who=there"
+    check_rc "pos system bank run with params exits 0" 0 "$TR_RC"
+    check_contains "pos system bank run substitutes param" 'Running: echo hi "there"' "$TR_OUT"
+    check_contains "pos system bank run executes substituted command" "hi there" "$TR_OUT"
+
+    # B15: pos system bank add multiline + show — cmd_show retrieves the FULL script via arrays
+    # Negative control: bank_get + cut -f3 truncated the command at the first newline.
+    # (Brace-free script: {param} template detection would prompt on run in a non-TTY.)
+    : > "$sandbox/b15.bank.env"
+    ml_script="$(cat <<'SCRIPT'
+#!/usr/bin/env bash
+n=0
+while [ "$n" -lt 2 ]; do
+    n=$((n + 1))
+    echo "round $n: $(printf 'ok')"
+done
+SCRIPT
+)"
+    test_run env BANK_FILE="$sandbox/b15.bank.env" "$pos_bank" add "ml-demo" "Multiline demo" "$ml_script"
+    check_rc "pos system bank add multiline exits 0" 0 "$TR_RC"
+    test_run env BANK_FILE="$sandbox/b15.bank.env" "$pos_bank" show "ml-demo"
+    check_rc "pos system bank show multiline exits 0" 0 "$TR_RC"
+    check_contains "pos system bank show prints script shebang" '#!/usr/bin/env bash' "$TR_OUT"
+    check_contains "pos system bank show prints loop line" 'while [ "$n" -lt 2 ]; do' "$TR_OUT"
+    check_contains "pos system bank show prints arithmetic line" 'n=$((n + 1))' "$TR_OUT"
+    check_contains "pos system bank show prints substitution echo" 'echo "round $n: $(printf' "$TR_OUT"
+
+    # B16: pos system bank run multiline — executes the WHOLE script via eval of the full command
+    test_run env BANK_FILE="$sandbox/b15.bank.env" "$pos_bank" run "ml-demo"
+    check_rc "pos system bank run multiline exits 0" 0 "$TR_RC"
+    check_contains "pos system bank run multiline output line 1" "round 1: ok" "$TR_OUT"
+    check_contains "pos system bank run multiline output line 2" "round 2: ok" "$TR_OUT"
+
+    # ═══════════════════════════════════════════════════════════════
+    # Part B2: pos system bank alias — managed ~/.bashrc block
+    # ═══════════════════════════════════════════════════════════════
+
+    local A_START='# >>> pos bank aliases (managed by pos system bank — do not hand-edit) <<<'
+    local A_END='# <<< pos bank aliases (managed by pos system bank) <<<'
+
+    # B17: alias create writes the managed block with the exact line format
+    : > "$sandbox/b17.bank.env"
+    : > "$sandbox/b17.bashrc"
+    test_run env BANK_FILE="$sandbox/b17.bank.env" BASH_RC_FILE="$sandbox/b17.bashrc" "$pos_bank" add "backup" "Backup" "rsync -a src/ dst/"
+    check_rc "pos system bank add for alias exits 0" 0 "$TR_RC"
+    test_run env BANK_FILE="$sandbox/b17.bank.env" BASH_RC_FILE="$sandbox/b17.bashrc" "$pos_bank" alias "backup" "bk"
+    check_rc "pos system bank alias create exits 0" 0 "$TR_RC"
+    check_contains "pos system bank alias create confirms" "Alias 'bk'" "$TR_OUT"
+    check_contains "pos system bank alias create hints source" "source $sandbox/b17.bashrc" "$TR_OUT"
+    if grep -qF "alias bk='pos system bank run backup'" "$sandbox/b17.bashrc" \
+        && grep -qF "$A_START" "$sandbox/b17.bashrc" \
+        && grep -qF "$A_END" "$sandbox/b17.bashrc"; then
+        printf '  PASS  alias create writes managed block with exact line\n'
+    else
+        printf '  FAIL  alias create writes managed block with exact line\n'
+    fi
+
+    # B18: alias create is idempotent — same alias name stays a single line
+    test_run env BANK_FILE="$sandbox/b17.bank.env" BASH_RC_FILE="$sandbox/b17.bashrc" "$pos_bank" alias "backup" "bk"
+    check_rc "pos system bank alias create idempotent exits 0" 0 "$TR_RC"
+    local cnt18
+    cnt18="$(grep -c '^alias bk=' "$sandbox/b17.bashrc" || true)"
+    [ "$cnt18" -eq 1 ] && printf '  PASS  alias create stays a single line when repeated\n' \
+        || printf '  FAIL  alias create stays a single line when repeated (count=%s)\n' "$cnt18"
+
+    # B19: alias list — shows the header and the alias row
+    test_run env BANK_FILE="$sandbox/b17.bank.env" BASH_RC_FILE="$sandbox/b17.bashrc" "$pos_bank" alias list
+    check_rc "pos system bank alias list exits 0" 0 "$TR_RC"
+    check_contains "pos system bank alias list shows header" "BANK ALIASES" "$TR_OUT"
+    check_contains "pos system bank alias list shows bk row" "bk" "$TR_OUT"
+    check_contains "pos system bank alias list shows target" "pos system bank run backup" "$TR_OUT"
+
+    # B20: alias list without a block errors
+    : > "$sandbox/b20.bashrc"
+    test_run env BANK_FILE="$sandbox/b17.bank.env" BASH_RC_FILE="$sandbox/b20.bashrc" "$pos_bank" alias list
+    check_not_contains "pos system bank alias list no-block exits non-zero" "0" "$TR_RC"
+    check_contains "pos system bank alias list no-block message" "No alias block" "$TR_OUT"
+
+    # B21: alias for an unknown bank command errors
+    test_run env BANK_FILE="$sandbox/b17.bank.env" BASH_RC_FILE="$sandbox/b17.bashrc" "$pos_bank" alias "ghost"
+    check_not_contains "pos system bank alias unknown bank exits non-zero" "0" "$TR_RC"
+    check_contains "pos system bank alias unknown bank message" "Command not found" "$TR_OUT"
+
+    # B22: invalid alias name errors
+    test_run env BANK_FILE="$sandbox/b17.bank.env" BASH_RC_FILE="$sandbox/b17.bashrc" "$pos_bank" alias "backup" "1bad"
+    check_not_contains "pos system bank alias invalid name exits non-zero" "0" "$TR_RC"
+    check_contains "pos system bank alias invalid name message" "Invalid alias name" "$TR_OUT"
+
+    # B23: PATH-shadowed alias warns (non-blocking)
+    : > "$sandbox/b23.bank.env"
+    : > "$sandbox/b23.bashrc"
+    test_run env BANK_FILE="$sandbox/b23.bank.env" BASH_RC_FILE="$sandbox/b23.bashrc" "$pos_bank" add "cat" "Cat" "cat file"
+    check_rc "pos system bank add path-shadow cmd exits 0" 0 "$TR_RC"
+    test_run env BANK_FILE="$sandbox/b23.bank.env" BASH_RC_FILE="$sandbox/b23.bashrc" "$pos_bank" alias "cat"
+    check_rc "pos system bank alias path-shadow still exits 0" 0 "$TR_RC"
+    check_contains "pos system bank alias path-shadow warns" "also a command on PATH" "$TR_OUT"
+
+    # B24: alias colliding with an outer (unmanaged) alias is refused, file untouched
+    : > "$sandbox/b24.bank.env"
+    printf '%s\n' "alias ls='ls --color=auto'" "# my config" > "$sandbox/b24.bashrc"
+    test_run env BANK_FILE="$sandbox/b24.bank.env" BASH_RC_FILE="$sandbox/b24.bashrc" "$pos_bank" add "ls" "Ls" "ls -la"
+    check_rc "pos system bank add for collision exits 0" 0 "$TR_RC"
+    test_run env BANK_FILE="$sandbox/b24.bank.env" BASH_RC_FILE="$sandbox/b24.bashrc" "$pos_bank" alias "ls"
+    check_not_contains "pos system bank alias collision exits non-zero" "0" "$TR_RC"
+    check_contains "pos system bank alias collision message" "already defined outside the managed block" "$TR_OUT"
+    if grep -qF "alias ls='ls --color=auto'" "$sandbox/b24.bashrc" \
+        && ! grep -qF "$A_START" "$sandbox/b24.bashrc"; then
+        printf '  PASS  alias collision leaves bashrc untouched\n'
+    else
+        printf '  FAIL  alias collision leaves bashrc untouched\n'
+    fi
+
+    # B25: retarget + multiple aliases — alias name is the key; alias <name> [alias_name]
+    : > "$sandbox/b25.bank.env"
+    : > "$sandbox/b25.bashrc"
+    test_run env BANK_FILE="$sandbox/b25.bank.env" BASH_RC_FILE="$sandbox/b25.bashrc" "$pos_bank" add "backup" "Backup" "rsync"
+    test_run env BANK_FILE="$sandbox/b25.bank.env" BASH_RC_FILE="$sandbox/b25.bashrc" "$pos_bank" add "df-x" "Df" "df -h"
+    test_run env BANK_FILE="$sandbox/b25.bank.env" BASH_RC_FILE="$sandbox/b25.bashrc" "$pos_bank" alias "backup" "bk"
+    check_rc "pos system bank alias first exits 0" 0 "$TR_RC"
+    # retarget: same alias name bk now points at df-x via a different bank name
+    test_run env BANK_FILE="$sandbox/b25.bank.env" BASH_RC_FILE="$sandbox/b25.bashrc" "$pos_bank" alias "df-x" "bk"
+    check_rc "pos system bank alias retarget exits 0" 0 "$TR_RC"
+    if grep -qF "alias bk='pos system bank run df-x'" "$sandbox/b25.bashrc" \
+        && ! grep -qF "alias bk='pos system bank run backup'" "$sandbox/b25.bashrc"; then
+        printf '  PASS  alias with same alias name retargets the existing line\n'
+    else
+        printf '  FAIL  alias with same alias name retargets the existing line\n'
+    fi
+    # a second distinct alias for the same bank command is allowed
+    test_run env BANK_FILE="$sandbox/b25.bank.env" BASH_RC_FILE="$sandbox/b25.bashrc" "$pos_bank" alias "backup" "bku"
+    check_rc "pos system bank alias second name exits 0" 0 "$TR_RC"
+    local cnt25
+    cnt25="$(grep -c '^alias ' "$sandbox/b25.bashrc" || true)"
+    [ "$cnt25" -eq 2 ] && printf '  PASS  two aliases coexist (2 lines)\n' \
+        || printf '  FAIL  two aliases coexist (lines=%s)\n' "$cnt25"
+
+    # B26: alias remove keeps the block when other aliases remain
+    test_run env BANK_FILE="$sandbox/b25.bank.env" BASH_RC_FILE="$sandbox/b25.bashrc" "$pos_bank" alias remove "bk"
+    check_rc "pos system bank alias remove exits 0" 0 "$TR_RC"
+    check_contains "pos system bank alias remove confirms" "Removed alias 'bk'" "$TR_OUT"
+    if grep -qF "$A_START" "$sandbox/b25.bashrc" && grep -qF "$A_END" "$sandbox/b25.bashrc" \
+        && ! grep -qF "alias bk=" "$sandbox/b25.bashrc" \
+        && grep -qF "alias bku=" "$sandbox/b25.bashrc"; then
+        printf '  PASS  alias remove keeps block with remaining aliases\n'
+    else
+        printf '  FAIL  alias remove keeps block with remaining aliases\n'
+    fi
+
+    # B27: removing the last alias cleans the block from the file entirely
+    : > "$sandbox/b27.bank.env"
+    : > "$sandbox/b27.bashrc"
+    test_run env BANK_FILE="$sandbox/b27.bank.env" BASH_RC_FILE="$sandbox/b27.bashrc" "$pos_bank" add "deploy" "Deploy" "deploy.sh"
+    test_run env BANK_FILE="$sandbox/b27.bank.env" BASH_RC_FILE="$sandbox/b27.bashrc" "$pos_bank" alias "deploy" "d"
+    test_run env BANK_FILE="$sandbox/b27.bank.env" BASH_RC_FILE="$sandbox/b27.bashrc" "$pos_bank" alias remove "d"
+    check_rc "pos system bank alias remove last exits 0" 0 "$TR_RC"
+    if ! grep -qF "$A_START" "$sandbox/b27.bashrc" && [ ! -s "$sandbox/b27.bashrc" ]; then
+        printf '  PASS  removing last alias cleans block and empties file\n'
+    else
+        printf '  FAIL  removing last alias cleans block and empties file\n'
+    fi
+
+    # B28: removing a missing alias errors (block present)
+    : > "$sandbox/b28.bank.env"
+    : > "$sandbox/b28.bashrc"
+    test_run env BANK_FILE="$sandbox/b28.bank.env" BASH_RC_FILE="$sandbox/b28.bashrc" "$pos_bank" add "deploy" "Deploy" "deploy.sh"
+    test_run env BANK_FILE="$sandbox/b28.bank.env" BASH_RC_FILE="$sandbox/b28.bashrc" "$pos_bank" alias "deploy" "d"
+    test_run env BANK_FILE="$sandbox/b28.bank.env" BASH_RC_FILE="$sandbox/b28.bashrc" "$pos_bank" alias remove "nope"
+    check_not_contains "pos system bank alias remove missing exits non-zero" "0" "$TR_RC"
+    check_contains "pos system bank alias remove missing message" "not found" "$TR_OUT"
+
+    # B29: bank remove also drops aliases pointing at the removed command
+    : > "$sandbox/b29.bank.env"
+    : > "$sandbox/b29.bashrc"
+    test_run env BANK_FILE="$sandbox/b29.bank.env" BASH_RC_FILE="$sandbox/b29.bashrc" "$pos_bank" add "foo" "Foo" "echo foo"
+    test_run env BANK_FILE="$sandbox/b29.bank.env" BASH_RC_FILE="$sandbox/b29.bashrc" "$pos_bank" alias "foo" "f"
+    test_run env BANK_FILE="$sandbox/b29.bank.env" BASH_RC_FILE="$sandbox/b29.bashrc" "$pos_bank" remove "foo"
+    check_rc "pos system bank remove with alias exits 0" 0 "$TR_RC"
+    check_contains "pos system bank remove mentions alias cleanup" "Removed alias pointing to 'foo'" "$TR_OUT"
+    check_contains "pos system bank remove confirms" "Removed: foo" "$TR_OUT"
+    if ! grep -qF "alias f=" "$sandbox/b29.bashrc" && ! grep -qF "$A_START" "$sandbox/b29.bashrc"; then
+        printf '  PASS  bank remove drops alias and cleans block\n'
+    else
+        printf '  FAIL  bank remove drops alias and cleans block\n'
+    fi
+
+    # B30: unrelated bashrc content survives an alias add+remove round-trip byte-identically
+    : > "$sandbox/b30.bank.env"
+    printf '%s\n' "# user config" "export EDITOR=vim" "PATH=/custom:\$PATH" > "$sandbox/b30.orig"
+    cp "$sandbox/b30.orig" "$sandbox/b30.bashrc"
+    test_run env BANK_FILE="$sandbox/b30.bank.env" BASH_RC_FILE="$sandbox/b30.bashrc" "$pos_bank" add "tool" "Tool" "tool-cmd"
+    test_run env BANK_FILE="$sandbox/b30.bank.env" BASH_RC_FILE="$sandbox/b30.bashrc" "$pos_bank" alias "tool" "tl"
+    check_rc "pos system bank alias on custom bashrc exits 0" 0 "$TR_RC"
+    test_run env BANK_FILE="$sandbox/b30.bank.env" BASH_RC_FILE="$sandbox/b30.bashrc" "$pos_bank" alias remove "tl"
+    check_rc "pos system bank alias remove on custom bashrc exits 0" 0 "$TR_RC"
+    if cmp -s "$sandbox/b30.orig" "$sandbox/b30.bashrc"; then
+        printf '  PASS  unrelated bashrc content preserved byte-identically\n'
+    else
+        printf '  FAIL  unrelated bashrc content preserved byte-identically\n'
+    fi
+
+    # B31: malformed block (start marker without end) errors instead of rewriting
+    printf '%s\n' "$A_START" "alias broken='pos system bank run junk'" > "$sandbox/b31.bashrc"
+    : > "$sandbox/b31.bank.env"
+    test_run env BANK_FILE="$sandbox/b31.bank.env" BASH_RC_FILE="$sandbox/b31.bashrc" "$pos_bank" alias list
+    check_not_contains "pos system bank alias malformed block exits non-zero" "0" "$TR_RC"
+    check_contains "pos system bank alias malformed block message" "malformed" "$TR_OUT"
+
+    # B32: empty block lists cleanly
+    printf '%s\n' "$A_START" "$A_END" > "$sandbox/b32.bashrc"
+    : > "$sandbox/b32.bank.env"
+    test_run env BANK_FILE="$sandbox/b32.bank.env" BASH_RC_FILE="$sandbox/b32.bashrc" "$pos_bank" alias list
+    check_rc "pos system bank alias empty block exits 0" 0 "$TR_RC"
+    check_contains "pos system bank alias empty block message" "No aliases" "$TR_OUT"
+
+    # B33: alias remove without a name on a non-tty errors with usage
+    test_run env BANK_FILE="$sandbox/b27.bank.env" BASH_RC_FILE="$sandbox/b27.bashrc" "$pos_bank" alias remove
+    check_not_contains "pos system bank alias remove no-arg exits non-zero" "0" "$TR_RC"
+    check_contains "pos system bank alias remove no-arg usage" "pos system bank alias remove" "$TR_OUT"
+}
@@ -201,7 +201,7 @@ STUB
    for tool in pos-ai pos-ai-hf pos-ai-server pos-communication-matrix-listener \
                 pos-communication-matrix-sender pos-communication-scrcpy \
                 pos-communication-telegram-listener pos-communication-telegram-sender \
-                 pos-media-grab pos-network-download; do
+                 pos-media-yt-grab pos-network-download; do
        if grep -q "load_env_file" "$ROOT/bin/$tool"; then
            printf '  PASS  %s uses shared load_env_file\n' "$tool"
        else
@@ -0,0 +1,174 @@
+#!/usr/bin/env bash
+set -euo pipefail
+# t-install-version.sh — install.sh version gate contract:
+#   match→skip with "Already installed", mismatch→proceed, --force bypass,
+#   no-git (empty) skip, dry-run variant, flag write after run,
+#   numeric comparison correctness (0.0c10 > 0.0c9).
+#
+# Seam: INSTALL_VERSION_OVERRIDE env var (presence check → empty = no-git path),
+# FLAGS_DIR env var (existing flag store seam).
+#
+# Proceed-path cases (2/3/4/5/8) use --skip all phases instead of --dry-run
+# because postinstall.sh is not fully dry-run safe (cat on non-existent file
+# after dry-run copy). Skipping all phases is functionally equivalent — the
+# gate fires before phases, and the banner + flag write still execute.
+
+run_test() {
+    local sandbox stubs flags_dir install_sh
+
+    sandbox="$(mksandbox install-version)"
+    stubs="$sandbox/stubs"
+    flags_dir="$sandbox/flags"
+    mkdir -p "$stubs" "$flags_dir"
+
+    install_sh="$ROOT/install.sh"
+
+    # sudo stub: just exec its arguments (bypasses real sudo in sandbox)
+    cat > "$stubs/sudo" <<'STUB'
+#!/usr/bin/env bash
+exec "$@"
+STUB
+    chmod +x "$stubs/sudo"
+
+    # install stub: delegate to the real install binary (needed so -d/-m flags
+    # work; we only shadow 'sudo' to avoid needing a tty/password)
+    cat > "$stubs/install" <<'STUB'
+#!/usr/bin/env bash
+exec /usr/bin/install "$@"
+STUB
+    chmod +x "$stubs/install"
+
+    # mkdir stub: just exec its arguments
+    cat > "$stubs/mkdir" <<'STUB'
+#!/usr/bin/env bash
+exec "$@"
+STUB
+    chmod +x "$stubs/mkdir"
+
+    local base_env=(PATH="$stubs:/usr/bin:/bin"
+        HOME="$sandbox/home"
+        FLAGS_DIR="$flags_dir")
+
+    # Helper: run install.sh with env overrides and capture output+rc.
+    run_install() {
+        local envs=() args=()
+        while [ $# -gt 0 ]; do
+            if [ "$1" = "--" ]; then shift; break; fi
+            envs+=("$1"); shift
+        done
+        args=("$@")
+        set +e
+        TR_OUT="$(env "${base_env[@]}" "${envs[@]}" bash "$install_sh" "${args[@]}" 2>&1)"
+        TR_RC=$?
+        set -e
+    }
+
+    # Helper: set a flag value directly (for pre-seeding installed_version)
+    set_flag() {
+        local name="$1" value="$2"
+        mkdir -p "$flags_dir"
+        printf '%s' "$value" > "$flags_dir/$name"
+    }
+
+    # Helper: read a flag value
+    get_flag() {
+        local name="$1"
+        local f="$flags_dir/$name"
+        [ -f "$f" ] && cat "$f" || printf ''
+    }
+
+    # ═══════════════════════════════════════════════════════════════
+    # Case 1: Match → skip ("Already installed")
+    #   Gate exits BEFORE any phase — safe without --dry-run or --skip.
+    # ═══════════════════════════════════════════════════════════════
+    set_flag "installed_version" "0.0c10"
+    run_install INSTALL_VERSION_OVERRIDE=0.0c10
+    check_rc "C1 match→skip exit code" 0 "$TR_RC"
+    check_contains "C1 match→skip message" "Already installed (0.0c10)" "$TR_OUT"
+
+    # ═══════════════════════════════════════════════════════════════
+    # Case 2: Mismatch → proceed (gate doesn't match, phases skipped)
+    # ═══════════════════════════════════════════════════════════════
+    rm -f "$flags_dir/installed_version"
+    set_flag "installed_version" "0.0c10"
+    run_install INSTALL_VERSION_OVERRIDE=0.0c11 -- --skip preinstall,scripts,postinstall,scalepoint
+    check_rc "C2 mismatch→proceed exit code" 0 "$TR_RC"
+    check_not_contains "C2 mismatch does not skip" "Already installed" "$TR_OUT"
+
+    # ═══════════════════════════════════════════════════════════════
+    # Case 3: Force bypasses match
+    # ═══════════════════════════════════════════════════════════════
+    rm -f "$flags_dir/installed_version"
+    set_flag "installed_version" "0.0c10"
+    run_install INSTALL_VERSION_OVERRIDE=0.0c10 -- --skip preinstall,scripts,postinstall,scalepoint --force
+    check_rc "C3 force bypasses exit code" 0 "$TR_RC"
+    check_not_contains "C3 force bypasses skip" "Already installed" "$TR_OUT"
+
+    # ═══════════════════════════════════════════════════════════════
+    # Case 4: No git (empty version via presence check)
+    #   INSTALL_VERSION_OVERRIDE="" with ${var+x} → empty → gate skipped
+    # ═══════════════════════════════════════════════════════════════
+    rm -f "$flags_dir/installed_version"
+    set_flag "installed_version" "0.0c10"
+    run_install INSTALL_VERSION_OVERRIDE="" -- --skip preinstall,scripts,postinstall,scalepoint
+    check_rc "C4 empty override→proceeds exit code" 0 "$TR_RC"
+    check_not_contains "C4 empty override does not skip" "Already installed" "$TR_OUT"
+
+    # ═══════════════════════════════════════════════════════════════
+    # Case 5: No installed flag → gate doesn't block
+    # ═══════════════════════════════════════════════════════════════
+    rm -f "$flags_dir/installed_version"
+    run_install INSTALL_VERSION_OVERRIDE=0.0c10 -- --skip preinstall,scripts,postinstall,scalepoint
+    check_rc "C5 no flag→proceeds exit code" 0 "$TR_RC"
+    check_not_contains "C5 no flag does not skip" "Already installed" "$TR_OUT"
+
+    # ═══════════════════════════════════════════════════════════════
+    # Case 6: Dry-run + match → "Would skip" (not "Already installed")
+    # ═══════════════════════════════════════════════════════════════
+    rm -f "$flags_dir/installed_version"
+    set_flag "installed_version" "0.0c10"
+    run_install INSTALL_VERSION_OVERRIDE=0.0c10 -- --dry-run
+    check_rc "C6 dry-run match exit code" 0 "$TR_RC"
+    check_contains "C6 dry-run shows Would skip" "Would skip install" "$TR_OUT"
+    check_not_contains "C6 dry-run not Already installed" "Already installed" "$TR_OUT"
+
+    # ═══════════════════════════════════════════════════════════════
+    # Case 7: Flag written after successful run
+    #   All phases skipped; sudo/install/mkdir stubs on PATH so
+    #   flag_set's `run sudo install` actually creates the flag file.
+    # ═══════════════════════════════════════════════════════════════
+    rm -f "$flags_dir/installed_version"
+    set_flag "installed_version" "0.0c10"
+    run_install INSTALL_VERSION_OVERRIDE=0.0c11 -- --skip preinstall,scripts,postinstall,scalepoint
+    check_rc "C7 all-skip exit code" 0 "$TR_RC"
+    local flag_val
+    flag_val="$(get_flag installed_version)"
+    check_eq "C7 flag written with current version" "0.0c11" "$flag_val"
+
+    # ═══════════════════════════════════════════════════════════════
+    # Case 8: Numeric comparison — 0.0c10 > 0.0c9 (not blocked)
+    # ═══════════════════════════════════════════════════════════════
+    rm -f "$flags_dir/installed_version"
+    set_flag "installed_version" "0.0c9"
+    run_install INSTALL_VERSION_OVERRIDE=0.0c10 -- --skip preinstall,scripts,postinstall,scalepoint
+    check_rc "C8 numeric 10>9 proceeds exit code" 0 "$TR_RC"
+    check_not_contains "C8 numeric 10>9 does not skip" "Already installed" "$TR_OUT"
+
+    # Also test: 0.0c9 with installed 0.0c10 → NOT a match
+    rm -f "$flags_dir/installed_version"
+    set_flag "installed_version" "0.0c10"
+    run_install INSTALL_VERSION_OVERRIDE=0.0c9 -- --skip preinstall,scripts,postinstall,scalepoint
+    check_rc "C8 numeric 9≠10 proceeds exit code" 0 "$TR_RC"
+    check_not_contains "C8 numeric 9≠10 does not skip" "Already installed" "$TR_OUT"
+
+    # ═══════════════════════════════════════════════════════════════
+    # Case 9: Force + match → still writes flag
+    # ═══════════════════════════════════════════════════════════════
+    rm -f "$flags_dir/installed_version"
+    set_flag "installed_version" "0.0c10"
+    run_install INSTALL_VERSION_OVERRIDE=0.0c10 -- --skip preinstall,scripts,postinstall,scalepoint --force
+    check_rc "C9 force+match exit code" 0 "$TR_RC"
+    local flag_val9
+    flag_val9="$(get_flag installed_version)"
+    check_eq "C9 force writes flag" "0.0c10" "$flag_val9"
+}
@@ -0,0 +1,279 @@
+#!/usr/bin/env bash
+set -euo pipefail
+# t-pos-media-yt.sh — POS--9 verification for the unified `pos media yt`
+# suite and its forwarders.
+#
+#   Part 1: dispatcher + forwarder resolution (bin/pos-media-yt, pos-media-mp3/
+#           mp4/grab forwarders, full chain through bin/pos)
+#   Part 2: lib/yt-lib.sh shared helpers (deps, url validation, classify)
+#   Part 3: yt-mp3 behaviors (flags, dry-run, YT_OUT_DIR seam, unsafe-URL guard)
+#   Part 4: yt-mp4 behaviors (format select flags, mutual exclusions, seam)
+#   Part 5: yt-grab classification + delegation (dry-run command strings) + config
+#   Part 6: yt-subtitles (defaults, --lang en,ar single-arg, formats),
+#           txt conversion (timestamps stripped), unavailable-subs detection
+#   Part 7: negative controls mandated by the Architect contract
+
+run_test() {
+    local sandbox stubs cfg
+    sandbox="$(mksandbox media-yt)"
+    stubs="$sandbox/stubs"
+    cfg="$sandbox/cfg"
+    mkdir -p "$stubs" "$cfg"
+
+    local ytdlp_log="$sandbox/ytdlp.log"
+    : > "$ytdlp_log"
+    # fake yt-dlp logs its exact argv (one per line) — lets us assert arg
+    # counting / no-expansion WITHOUT any network or real binary.
+    cat > "$stubs/yt-dlp" <<STUB
+#!/usr/bin/env bash
+printf 'yt-dlp %s\\n' "\$*" >> "$ytdlp_log"
+STUB
+    # ffmpeg stub: satisfies the non-dry-run deps guard; not actually used.
+    printf '#!/usr/bin/env bash\nexit 0\n' > "$stubs/ffmpeg"
+    chmod +x "$stubs/yt-dlp" "$stubs/ffmpeg"
+
+    local RB="$ROOT/bin"
+    local yt ytd="$RB/pos-media-yt" mp3="$RB/pos-media-yt-mp3" \
+          mp4="$RB/pos-media-yt-mp4" grab="$RB/pos-media-yt-grab" \
+          subs="$RB/pos-media-yt-subtitles"
+    local env_base=(PATH="$stubs:$RB:/usr/bin:/bin" CONFIG_DIR="$cfg" \
+                    YT_OUT_DIR="$sandbox/out")
+
+    # ═══ Part 1: dispatcher + forwarders ═══
+    # 1.0 bare dispatcher → usage listing subcommands (exit 0)
+    test_run_env "${env_base[@]}" -- "$ytd"
+    check_rc "dispatcher bare invocation = usage exit 0" 0 "$TR_RC"
+    check_contains "dispatcher usage lists mp3" "mp3" "$TR_OUT"
+    check_contains "dispatcher usage lists subtitles" "subtitles" "$TR_OUT"
+
+    # 1.1 dispatcher unknown subcommand → hard error, nonzero
+    test_run_env "${env_base[@]}" -- "$ytd" bogus
+    [ "$TR_RC" -ne 0 ] && printf '  PASS  dispatcher unknown subcommand exits nonzero\n' \
+                       || printf '  FAIL  dispatcher unknown subcommand exited 0\n'
+    check_contains "dispatcher unknown subcommand message" "unknown yt command" "$TR_OUT"
+
+    # 1.2 forwarder helpers: --help passes through to the real yt usage
+    test_run_env "${env_base[@]}" -- "$RB/pos-media-mp3" --help
+    check_rc "pos media mp3 --help forwards cleanly" 0 "$TR_RC"
+    check_contains "mp3 forwarder shows yt-mp3 usage" "pos media yt mp3 [options]" "$TR_OUT"
+
+    test_run_env "${env_base[@]}" -- "$RB/pos-media-mp4" --help
+    check_rc "pos media mp4 --help forwards cleanly" 0 "$TR_RC"
+    check_contains "mp4 forwarder shows yt-mp4 usage" "pos media yt mp4 [options]" "$TR_OUT"
+
+    test_run_env "${env_base[@]}" -- "$RB/pos-media-grab" --help
+    check_rc "pos media grab --help forwards cleanly" 0 "$TR_RC"
+    check_contains "grab forwarder shows yt-grab usage" "pos media yt grab [options]" "$TR_OUT"
+
+    # 1.3 ytsync forwarder --help forwards to pos media ytsync
+    test_run_env "${env_base[@]}" -- "$RB/pos-media-yt-ytsync" --help
+    check_contains "ytsync forwarder references media ytsync" "media ytsync" "$TR_OUT"
+
+    # 1.4 full dispatch chain: `pos media mp3 <url>` → yt-mp3 (fake yt-dlp called).
+    #    `media-yt-mp3` is non-interactive so bin/pos execs it without a tee.
+    : > "$ytdlp_log"
+    test_run_env "${env_base[@]}" -- "$RB/pos" media mp3 "http://example.com/x"
+    check_rc "chain pos media mp3 <url> resolves" 0 "$TR_RC"
+    check_contains "chain reaches yt-dlp with -x (audio path)" "-x" "$(cat "$ytdlp_log")"
+
+    # ═══ Part 2: lib/yt-lib.sh helpers ═══
+    source "$ROOT/lib/common.sh"
+    source "$ROOT/lib/yt-lib.sh"
+    # 2.0 yt_validate_url accepts http(s), rejects junk
+    yt_validate_url "https://youtube.com/watch?v=x" && printf '  PASS  url valid http/https accepted\n' \
+                       || printf '  FAIL  valid https url rejected\n'
+    test_run yt_validate_url "ftp://bad"
+    [ "$TR_RC" -ne 0 ] && printf '  PASS  invalid url rejected\n' || printf '  FAIL  invalid url accepted\n'
+    check_contains "invalid url error message" "not a valid URL" "$TR_OUT"
+
+    # 2.1 classify_url: audio / video / unknown-with-GRAB_DEFAULT
+    check_eq "music.youtube → audio" "audio" "$(classify_url "https://music.youtube.com/watch?v=x")"
+    check_eq "soundcloud → audio" "audio" "$(classify_url "https://soundcloud.com/a/b")"
+    check_eq "youtube.com → video" "video" "$(classify_url "https://youtube.com/watch?v=x")"
+    check_eq "vimeo → video" "video" "$(classify_url "https://vimeo.com/123")"
+    check_eq "unknown → default video" "video" "$(classify_url "https://example.com/x")"
+    check_eq "unknown → GRAB_DEFAULT=audio" "audio" "$(GRAB_DEFAULT=audio classify_url "https://example.com/x")"
+
+    # ═══ Part 3: yt-mp3 ═══
+    # 3.0 dry-run requires no deps and prints the yt-dlp command (audio flags)
+    test_run_env "${env_base[@]}" -- "$mp3" --dry-run "https://youtube.com/watch?v=dQw4w9WgXcQ"
+    check_rc "mp3 dry-run ok" 0 "$TR_RC"
+    check_contains "mp3 dry-run has -x --audio-format mp3" "--audio-format mp3" "$TR_OUT"
+    check_contains "mp3 dry-run has --embed-metadata" "--embed-metadata" "$TR_OUT"
+
+    # 3.1 --by-artist template
+    test_run_env "${env_base[@]}" -- "$mp3" --dry-run --by-artist "https://youtu.be/x"
+    check_contains "mp3 --by-artist organizes by artist/uploader" "%(artist,uploader)s/" "$TR_OUT"
+
+    # 3.2 --no-playlist propagated
+    test_run_env "${env_base[@]}" -- "$mp3" --dry-run --no-playlist "https://youtube.com/watch?v=x"
+    check_contains "mp3 --no-playlist passed through" "--no-playlist" "$TR_OUT"
+
+    # 3.3 --cookies must exist
+    test_run_env "${env_base[@]}" -- "$mp3" --dry-run --cookies "$sandbox/nope.txt" "https://youtube.com/watch?v=x"
+    [ "$TR_RC" -ne 0 ] && printf '  PASS  mp3 missing cookies file errors\n' \
+                       || printf '  FAIL  mp3 accepted missing cookies file\n'
+
+    # 3.4 YT_OUT_DIR seam overrides default output
+    test_run_env "${env_base[@]}" -- "$mp3" --dry-run "https://youtube.com/watch?v=x"
+    check_contains "mp3 uses YT_OUT_DIR seam" "$sandbox/out/%(title)s.%(ext)s" "$TR_OUT"
+
+    # 3.5 missing dep in non-dry-run → hard error (no yt-dlp on PATH at all)
+    test_run_env PATH="/usr/bin:/bin" -- "$mp3" "https://youtube.com/watch?v=x"
+    [ "$TR_RC" -ne 0 ] && printf '  PASS  mp3 without yt-dlp in path errors\n' \
+                       || printf '  FAIL  mp3 ran without yt-dlp present\n'
+
+    # 3.6 no URL → usage exit 0
+    test_run_env "${env_base[@]}" -- "$mp3" --dry-run
+    check_rc "mp3 no URL → usage exit 0" 0 "$TR_RC"
+    check_contains "mp3 no URL prints usage" "Usage: pos media yt mp3" "$TR_OUT"
+
+    # 3.7 NEGATIVE CONTROL: unsafe URL not expanded — passed as ONE literal arg.
+    #    `$(echo pwned)` stays literal inside the URL token; no second pwned word
+    #    appears in the argv log (which would mean command substitution ran).
+    : > "$ytdlp_log"
+    bad='$(echo pwned)'
+    test_run_env "${env_base[@]}" -- "$mp3" "http://example.com/$bad"
+    check_rc "unsafe URL run (fake yt-dlp) ok" 0 "$TR_RC"
+    local logged; logged="$(cat "$ytdlp_log")"
+    check_contains "url passed literally (single arg)" "\$(echo pwned)" "$logged"
+    check_not_contains "no separate pwned word from substitution" "example.com/  pwned" "$logged"
+
+    # ═══ Part 4: yt-mp4 ═══
+    # 4.0 --best
+    test_run_env "${env_base[@]}" -- "$mp4" --dry-run --best "https://youtube.com/watch?v=x"
+    check_contains "mp4 --best selects bestvideo+bestaudio" "bestvideo*+bestaudio/best" "$TR_OUT"
+
+    # 4.1 --worst
+    test_run_env "${env_base[@]}" -- "$mp4" --dry-run --worst "https://youtube.com/watch?v=x"
+    check_contains "mp4 --worst selects worst" "-f worst" "$TR_OUT"
+
+    # 4.2 -f id skips prompt
+    test_run_env "${env_base[@]}" -- "$mp4" --dry-run -f 22 "https://youtube.com/watch?v=x"
+    check_contains "mp4 -f 22 (no prompt)" "-f 22" "$TR_OUT"
+
+    # 4.3 mutual exclusions
+    test_run_env "${env_base[@]}" -- "$mp4" --dry-run --best --worst "https://youtube.com/watch?v=x"
+    [ "$TR_RC" -ne 0 ] && printf '  PASS  mp4 --best/--worst mutually exclusive\n' \
+                       || printf '  FAIL  mp4 allowed --best and --worst together\n'
+    test_run_env "${env_base[@]}" -- "$mp4" --dry-run -f 22 --best "https://youtube.com/watch?v=x"
+    [ "$TR_RC" -ne 0 ] && printf '  PASS  mp4 --format/--best mutually exclusive\n' \
+                       || printf '  FAIL  mp4 allowed --format and --best together\n'
+
+    # 4.4 YT_OUT_DIR seam
+    test_run_env "${env_base[@]}" -- "$mp4" --dry-run --best "https://youtube.com/watch?v=x"
+    check_contains "mp4 uses YT_OUT_DIR seam" "$sandbox/out/%(title)s.%(ext)s" "$TR_OUT"
+
+    # 4.5 no URL → usage
+    test_run_env "${env_base[@]}" -- "$mp4" --dry-run --best
+    check_rc "mp4 no URL → usage exit 0" 0 "$TR_RC"
+    check_contains "mp4 no URL prints usage" "Usage: pos media yt mp4" "$TR_OUT"
+
+    # ═══ Part 5: yt-grab classification + delegation (dry-run) + config ═══
+    # 5.0 music.youtube → audio route (dry-run prints delegate command, no exec)
+    test_run_env "${env_base[@]}" -- "$grab" --dry-run "https://music.youtube.com/watch?v=abc"
+    check_contains "grab music.youtube routes to yt mp3" "pos media yt mp3" "$TR_OUT"
+    check_not_contains "grab music.youtube not routed to mp4" "pos media yt mp4" "$TR_OUT"
+
+    # 5.1 youtube.com → video route (default --best)
+    test_run_env "${env_base[@]}" -- "$grab" --dry-run "https://youtube.com/watch?v=xyz"
+    check_contains "grab youtube routes to yt mp4" "pos media yt mp4 --best" "$TR_OUT"
+
+    # 5.2 --audio forces audio despite video domain
+    test_run_env "${env_base[@]}" -- "$grab" --dry-run --audio "https://youtube.com/watch?v=abc"
+    check_contains "grab --audio forces yt mp3" "pos media yt mp3" "$TR_OUT"
+
+    # 5.3 --worst → video --worst
+    test_run_env "${env_base[@]}" -- "$grab" --dry-run --worst "https://youtube.com/watch?v=abc"
+    check_contains "grab --worst routes to mp4 --worst" "pos media yt mp4 --worst" "$TR_OUT"
+
+    # 5.4 --audio + --video mutually exclusive
+    test_run_env "${env_base[@]}" -- "$grab" --dry-run --audio --video "https://youtube.com/watch?v=abc"
+    [ "$TR_RC" -ne 0 ] && printf '  PASS  grab --audio/--video mutually exclusive\n' \
+                       || printf '  FAIL  grab allowed --audio and --video together\n'
+
+    # 5.5 invalid URL
+    test_run_env "${env_base[@]}" -- "$grab" "not-a-url"
+    [ "$TR_RC" -ne 0 ] && printf '  PASS  grab rejects invalid url\n' \
+                       || printf '  FAIL  grab accepted invalid url\n'
+    check_contains "grab error prefixed yt-grab" "yt-grab:" "$TR_OUT"
+
+    # 5.6 unknown domain honors GRAB_DEFAULT via config file (audio)
+    printf 'GRAB_DEFAULT=audio\n' > "$cfg/grab.env"
+    test_run_env "${env_base[@]}" -- "$grab" --dry-run "https://example.com/x"
+    check_contains "grab unknown domain honors GRAB_DEFAULT=audio" "pos media yt mp3" "$TR_OUT"
+
+    # ═══ Part 6: yt-subtitles ═══
+    # 6.0 defaults: --write-subs --write-auto-subs --sub-langs best
+    test_run_env "${env_base[@]}" -- "$subs" --dry-run "https://youtube.com/watch?v=x"
+    check_contains "subs default writes manual subs" "--write-subs" "$TR_OUT"
+    check_contains "subs default writes auto subs" "--write-auto-subs" "$TR_OUT"
+    check_contains "subs default sub-langs best" "--sub-langs best" "$TR_OUT"
+
+    # 6.1 NEGATIVE CONTROL: --lang en,ar becomes ONE --sub-langs arg
+    test_run_env "${env_base[@]}" -- "$subs" --dry-run --lang en,ar "https://youtube.com/watch?v=x"
+    check_contains "subs --lang en,ar single arg" "--sub-langs en,ar" "$TR_OUT"
+    check_not_contains "subs does not split --lang (no single 'en')" "--sub-langs en " "$TR_OUT"
+
+    # 6.2 --format vtt
+    test_run_env "${env_base[@]}" -- "$subs" --dry-run --format vtt "https://youtube.com/watch?v=x"
+    check_contains "subs --format vtt" "--sub-format vtt" "$TR_OUT"
+
+    # 6.3 --auto-only drops --write-subs
+    test_run_env "${env_base[@]}" -- "$subs" --dry-run --auto-only "https://youtube.com/watch?v=x"
+    check_not_contains "subs --auto-only drops manual subs" "--write-subs" "$TR_OUT"
+    check_contains "subs --auto-only keeps auto subs" "--write-auto-subs" "$TR_OUT"
+
+    # 6.4 --output dir template
+    test_run_env "${env_base[@]}" -- "$subs" --dry-run --output "$sandbox/subs" "https://youtube.com/watch?v=x"
+    check_contains "subs --output template" "$sandbox/subs/%(title)s.%(sub_lang)s.%(ext)s" "$TR_OUT"
+
+    # 6.5 invalid --format
+    test_run_env "${env_base[@]}" -- "$subs" --dry-run --format bogus "https://youtube.com/watch?v=x"
+    [ "$TR_RC" -ne 0 ] && printf '  PASS  subs rejects unknown format\n' \
+                       || printf '  FAIL  subs accepted unknown format\n'
+
+    # 6.6 unavailable subs: fake yt-dlp fails with no-subtitle stderr → friendly error
+    mkdir -p "$stubs/subsfail"
+    cat > "$stubs/subsfail/yt-dlp" <<STUB
+#!/usr/bin/env bash
+printf 'ERROR: no subtitles found' >&2
+exit 1
+STUB
+    chmod +x "$stubs/subsfail/yt-dlp"
+    test_run_env PATH="$stubs/subsfail:/usr/bin:/bin" -- "$subs" "https://youtube.com/watch?v=x"
+    [ "$TR_RC" -ne 0 ] && printf '  PASS  subs no-subtitles exits nonzero\n' \
+                       || printf '  FAIL  subs no-subtitles exited 0\n'
+    check_contains "subs unavailable-subs message" "unavailable subtitles" "$TR_OUT"
+
+    # 6.7 NEGATIVE CONTROL: txt conversion strips SRT timestamps — run the real
+#    tool non-dry with a fake yt-dlp that writes an .srt into the cwd; the txt
+#    converter must strip timestamps/html and keep the words.
+    local txtdir="$sandbox/txtdir"
+    mkdir -p "$txtdir" "$stubs/txtsubs"
+    cat > "$stubs/txtsubs/yt-dlp" <<STUB
+#!/usr/bin/env bash
+printf '1\\n00:00:01,000 --> 00:00:02,000\\nHello <i>world</i>\\n\\n2\\n00:00:03,000 --> 00:00:04,000\\nSecond line\\n' > foo.srt
+exit 0
+STUB
+    chmod +x "$stubs/txtsubs/yt-dlp"
+    (
+        cd "$txtdir"
+        env PATH="$stubs/txtsubs:/usr/bin:/bin" "$subs" --format txt "https://youtube.com/watch?v=x"
+    ) >"$sandbox/txtrun.log" 2>&1
+    local txt; txt="$(cat "$txtdir/foo.txt" 2>/dev/null || true)"
+    check_not_contains "txt output strips timestamps" "-->" "$txt"
+    check_not_contains "txt output strips html tags" "<i>" "$txt"
+    check_contains "txt output keeps words" "Hello world" "$txt"
+
+    # 6.8 subs dry-run skips deps (yt-dlp not in path) — needs no binaries
+    test_run_env PATH="/usr/bin:/bin" -- "$subs" --dry-run "https://youtube.com/watch?v=x"
+    check_rc "subs dry-run works without yt-dlp (skips deps)" 0 "$TR_RC"
+    check_contains "subs dry-run prints yt-dlp cmd" "yt-dlp" "$TR_OUT"
+
+    # 6.9 subs no URL → error (not usage), exit 1
+    test_run_env "${env_base[@]}" -- "$subs" --dry-run
+    [ "$TR_RC" -ne 0 ] && printf '  PASS  subs no URL exits nonzero\n' \
+                       || printf '  FAIL  subs no URL exited 0\n'
+    check_contains "subs no URL error message" "missing URL (see --help)" "$TR_OUT"
+}
@@ -0,0 +1,133 @@
+#!/usr/bin/env bash
+set -euo pipefail
+# t-telegram-listener-exec.sh — async command execution in the Telegram
+# listener.  Proves the listener can execute ANY valid Bash command without
+# blocking: simple output, compound commands, pipes, stderr, long-running
+# (timeout), and that the listener stays responsive while a command runs.
+#
+# Hermetic: stubbed curl (serves a canned getUpdates batch with /command
+# messages, then empty batches), stubbed systemctl, real jq/timeout.
+# No network, no real Telegram, no FFmpeg (unless /dev/video0 exists).
+
+run_test() {
+    require_cmd jq "telegram exec" || return 0
+    require_cmd timeout "telegram exec" || return 0
+
+    local sandbox stubs cfg curl_log marker listener batch
+    sandbox="$(mksandbox telegram-exec)"
+    stubs="$sandbox/stubs"
+    cfg="$sandbox/cfg"
+    curl_log="$sandbox/curl.log"
+    marker="$sandbox/executed.log"
+    listener="$ROOT/bin/pos-communication-telegram-listener"
+    mkdir -p "$stubs" "$cfg"
+    : > "$curl_log"
+    : > "$marker"
+
+    # ── command map: one /command per line, each triggers a known behavior ──
+    cat > "$cfg/telegram_commands.env" <<'MAP'
+/echo_hello=echo hello
+/compound=sleep 0.2 && echo done
+/stdout_test=printf 'line1\nline2\n'
+/stderr_test=bash -c 'echo error_msg >&2; echo output_msg'
+/pipe_test=echo "hello world" | tr ' ' '\n'
+/long_run=sleep 30
+/no_output=true
+/quiet_test=@quiet echo hello_quiet
+MAP
+
+    : > "$cfg/telegram_prefixes.env"
+
+    # ── stub curl ──
+    # Serve a batch with 8 commands (one per mapped /command), then empty.
+    local batch_file="$sandbox/batch.json"
+    cat > "$batch_file" <<'JSON'
+{"ok":true,"result":[
+ {"update_id":1,"message":{"message_id":10,"from":{"id":123},"chat":{"id":456},"text":"/echo_hello"}},
+ {"update_id":2,"message":{"message_id":11,"from":{"id":123},"chat":{"id":456},"text":"/compound"}},
+ {"update_id":3,"message":{"message_id":12,"from":{"id":123},"chat":{"id":456},"text":"/stdout_test"}},
+ {"update_id":4,"message":{"message_id":13,"from":{"id":123},"chat":{"id":456},"text":"/stderr_test"}},
+ {"update_id":5,"message":{"message_id":14,"from":{"id":123},"chat":{"id":456},"text":"/pipe_test"}},
+ {"update_id":6,"message":{"message_id":15,"from":{"id":123},"chat":{"id":456},"text":"/long_run"}},
+ {"update_id":7,"message":{"message_id":16,"from":{"id":123},"chat":{"id":456},"text":"/no_output"}},
+ {"update_id":8,"message":{"message_id":17,"from":{"id":123},"chat":{"id":456},"text":"/quiet_test"}}
+]}
+JSON
+
+    cat > "$stubs/curl" <<STUB
+#!/usr/bin/env bash
+printf 'curl %s\n' "\$*" >> "$curl_log"
+for a in "\$@"; do
+    case "\$a" in
+        *getUpdates*)
+            if [ ! -e "$sandbox/served.once" ]; then
+                touch "$sandbox/served.once"
+                cat "$batch_file"
+            else
+                sleep 1
+                printf '%s' '{"ok":true,"result":[]}'
+            fi
+            exit 0
+            ;;
+    esac
+done
+printf '%s' '{"ok":true}'
+STUB
+    chmod +x "$stubs/curl"
+
+    printf '#!/usr/bin/env bash\nexit 1\n' > "$stubs/systemctl"
+    chmod +x "$stubs/systemctl"
+
+    local common=(PATH="$stubs:/usr/bin:/bin" CONFIG_DIR="$cfg"
+        TELEGRAM_BOT_TOKEN=testbot TELEGRAM_CHAT_ID=456 TELEGRAM_OWNER_ID=123)
+
+    # ── run the listener ──
+    # /long_run (sleep 30) runs in background — the listener does NOT block.
+    # The 45s outer timeout proves the listener stayed responsive.
+    test_run_env "${common[@]}" -- timeout 45 "$listener" --run
+
+    local curl_content
+    curl_content="$(cat "$curl_log")"
+
+    # ── all commands were dispatched ──
+    check_contains "listener processed /echo_hello" "exec: /echo_hello" "$TR_OUT"
+    check_contains "listener processed /compound"   "exec: /compound"   "$TR_OUT"
+    check_contains "listener processed /long_run"   "exec: /long_run"   "$TR_OUT"
+
+    # ── /echo_hello → "hello" ──
+    check_contains "/echo_hello reply" "text=hello" "$curl_content"
+
+    # ── /compound (sleep 0.2 && echo done) → "done" ──
+    check_contains "/compound reply" "text=done" "$curl_content"
+
+    # ── /stdout_test → multi-line stdout captured ──
+    check_contains "/stdout_test reply" "text=line1" "$curl_content"
+
+    # ── /stderr_test → stderr+stdout both captured ──
+    # Output is "error_msg\noutput_msg" (newline-separated).
+    # The curl log may split this across lines, so check each token alone.
+    check_contains "/stderr_test stderr captured" "error_msg" "$curl_content"
+    check_contains "/stderr_test stdout captured" "output_msg" "$curl_content"
+
+    # ── /pipe_test → pipe works ──
+    check_contains "/pipe_test reply" "text=hello" "$curl_content"
+
+    # ── /no_output → "OK" (no output → default reply) ──
+    check_contains "/no_output reply" "text=OK" "$curl_content"
+
+    # ── /quiet_test → NO sendMessage with "hello_quiet" ──
+    # The setMyCommands call may contain "hello_quiet" in the description,
+    # so we check that no sendMessage line contains it.
+    local quiet_send_count
+    quiet_send_count="$(printf '%s' "$curl_content" | grep 'sendMessage' | grep -c 'hello_quiet' || true)"
+    check_eq "/quiet_test suppresses reply" 0 "$quiet_send_count"
+
+    # ── the daemon exited within the outer timeout (not hung) ──
+    # rc=124 means `timeout` killed it — listener was alive and processing.
+    # rc=0 means it exited cleanly.  Both prove no hang.
+    if [ "${TR_RC:-0}" -eq 124 ] || [ "${TR_RC:-0}" -eq 0 ]; then
+        printf '  PASS  daemon exited cleanly (rc=%s, not hung)\n' "${TR_RC}"
+    else
+        printf '  FAIL  daemon exited with unexpected rc=%s\n' "${TR_RC:-?}"
+    fi
+}
@@ -0,0 +1,169 @@
+#!/usr/bin/env bash
+set -euo pipefail
+# t-telegram-listener-reap.sh — regression tests for the listener crash-loop:
+#   (a) a background command exiting non-zero (254) must NOT kill the daemon.
+#       The old code reaped via `wait "$pid"` under `set -e`, so any non-zero
+#       child exit aborted the listener and systemd Restart=always crash-looped
+#       it (offset reset to 0 → duplicate re-delivery).  Reply must carry the
+#       real exit code.
+#   (b) getUpdates offset persistence: resumed from the state file across
+#       restarts (no duplicate burst after restart), invalid state falls back
+#       to 0, and empty batches never rewrite the file.
+#   (c) negative control: the OLD trap + `wait "$pid"` idiom still dies on 254
+#       (proves the regression is real and the fix works).
+# Hermetic: stubbed curl (no network), stubbed systemctl, real jq/flock/timeout.
+
+run_test() {
+    require_cmd jq "telegram reap" || return 0
+    require_cmd timeout "telegram reap" || return 0
+
+    local sandbox stubs cfg runtime home listener curl_log batch_file
+    sandbox="$(mksandbox telegram-reap)"
+    stubs="$sandbox/stubs"
+    cfg="$sandbox/cfg"
+    runtime="$sandbox/runtime"
+    home="$sandbox/home"
+    listener="$ROOT/bin/pos-communication-telegram-listener"
+    curl_log="$sandbox/curl.log"
+    mkdir -p "$stubs" "$cfg" "$runtime" "$home"
+    : > "$curl_log"
+
+    # ── command map: two commands with non-zero exits, one with output ──
+    cat > "$cfg/telegram_commands.env" <<'MAP'
+/fail254=exit 254
+/with_out=echo boom; false
+MAP
+    : > "$cfg/telegram_prefixes.env"
+
+    # ── stub curl ──
+    # Serve one batch with 2 commands, then empty batches (sleep keeps the
+    # empty-poll loop from spinning while the daemon runs).
+    batch_file="$sandbox/batch.json"
+    cat > "$batch_file" <<'JSON'
+{"ok":true,"result":[
+ {"update_id":1,"message":{"message_id":10,"from":{"id":123},"chat":{"id":456},"text":"/fail254"}},
+ {"update_id":2,"message":{"message_id":11,"from":{"id":123},"chat":{"id":456},"text":"/with_out"}}
+]}
+JSON
+
+    cat > "$stubs/curl" <<STUB
+#!/usr/bin/env bash
+printf 'curl %s\n' "\$*" >> "$curl_log"
+for a in "\$@"; do
+    case "\$a" in
+        *getUpdates*)
+            if [ ! -e "$sandbox/reap.served" ]; then
+                touch "$sandbox/reap.served"
+                cat "$batch_file"
+            else
+                sleep 1
+                printf '%s' '{"ok":true,"result":[]}'
+            fi
+            exit 0
+            ;;
+    esac
+done
+printf '%s' '{"ok":true}'
+STUB
+    chmod +x "$stubs/curl"
+
+    printf '#!/usr/bin/env bash\nexit 1\n' > "$stubs/systemctl"
+    chmod +x "$stubs/systemctl"
+
+    local common=(PATH="$stubs:/usr/bin:/bin" CONFIG_DIR="$cfg"
+        XDG_RUNTIME_DIR="$runtime" HOME="$home"
+        TELEGRAM_BOT_TOKEN=testbot TELEGRAM_CHAT_ID=456 TELEGRAM_OWNER_ID=123)
+
+    # ── (a) non-zero command exit must not kill the daemon ──
+    # rc=124 → `timeout` killed an alive-and-polling daemon; rc=0 → clean exit.
+    # With the old code the daemon itself died with 254, which is caught here.
+    test_run_env "${common[@]}" -- timeout 10 "$listener" --run
+
+    if [ "${TR_RC:-0}" -eq 124 ] || [ "${TR_RC:-0}" -eq 0 ]; then
+        printf '  PASS  daemon survived child exit 254 (rc=%s)\n' "${TR_RC}"
+    else
+        printf '  FAIL  daemon died with rc=%s (crash-loop regression)\n' "${TR_RC:-?}"
+    fi
+
+    check_contains "/fail254 dispatched" "exec: /fail254" "${TR_OUT:-}"
+    check_contains "/with_out dispatched" "exec: /with_out" "${TR_OUT:-}"
+
+    local curl_content
+    curl_content="$(cat "$curl_log")"
+    # The stub logs curl's RAW argv (--data-urlencode passes text unencoded
+    # to the wire, so the log shows "text=exit 254" with a real space).
+    # /fail254 has no output → reply text is "exit 254\nOK".
+    check_contains "/fail254 reply carries exit 254" "text=exit 254" "$curl_content"
+    # /with_out → "exit 1\nboom" — output preserved alongside the exit code.
+    check_contains "/with_out reply carries exit 1" "text=exit 1" "$curl_content"
+    check_contains "/with_out reply preserves output" "boom" "$curl_content"
+
+    # ── offset persistence: written after processing updates ──
+    # update 1 → offset 2 persisted (both messages advance the offset).
+    check_eq "offset persisted after processing" "3" "$(cat "$cfg/telegram-listener.state")"
+
+    # ── (b) offset resumed from the state file across restarts ──
+    # No state file → offset starts at 0; with one present it resumes from it.
+    local sb2 stubs2 cfg2 curl2
+    sb2="$sandbox/resume"
+    stubs2="$sb2/stubs"
+    cfg2="$sb2/cfg"
+    curl2="$sb2/curl.log"
+    mkdir -p "$stubs2" "$cfg2"
+    : > "$curl2"
+    printf '99\n' > "$cfg2/telegram-listener.state"
+    : > "$cfg2/telegram_commands.env"
+    : > "$cfg2/telegram_prefixes.env"
+
+    cat > "$stubs2/curl" <<STUB
+#!/usr/bin/env bash
+printf 'curl %s\n' "\$*" >> "$curl2"
+for a in "\$@"; do
+    case "\$a" in
+        *getUpdates*)
+            sleep 1
+            printf '%s' '{"ok":true,"result":[]}'
+            exit 0
+            ;;
+    esac
+done
+printf '%s' '{"ok":true}'
+STUB
+    chmod +x "$stubs2/curl"
+    printf '#!/usr/bin/env bash\nexit 1\n' > "$stubs2/systemctl"
+    chmod +x "$stubs2/systemctl"
+
+    local common2=(PATH="$stubs2:/usr/bin:/bin" CONFIG_DIR="$cfg2"
+        XDG_RUNTIME_DIR="$sb2/rt" HOME="$sb2/home"
+        TELEGRAM_BOT_TOKEN=testbot TELEGRAM_CHAT_ID=456 TELEGRAM_OWNER_ID=123)
+    mkdir -p "$sb2/rt" "$sb2/home"
+
+    test_run_env "${common2[@]}" -- timeout 3 "$listener" --run
+    check_contains "offset resumed from persisted state file" "offset=99" "$(cat "$curl2")"
+    # Empty batches never rewrite the state file.
+    check_eq "empty batches do not rewrite state" "99" "$(cat "$cfg2/telegram-listener.state")"
+
+    # invalid state file → fall back to 0
+    printf 'garbage\n' > "$cfg2/telegram-listener.state"
+    : > "$curl2"
+    test_run_env "${common2[@]}" -- timeout 3 "$listener" --run
+    check_contains "invalid state file falls back to offset 0" "offset=0" "$(cat "$curl2")"
+
+    # ── (c) negative control: the OLD trap + `wait "$pid"` idiom still dies ──
+    local old_rc old_out
+    set +e
+    old_out="$(bash -s 2>&1 <<'INNER'
+set -euo pipefail
+declare -A _EXIT_CODES=()
+trap 'while _p=$(wait -n 2>/dev/null); do _EXIT_CODES[$_p]=$?; done' CHLD
+exit 254 & pid=$!
+sleep 0.3
+wait "$pid" 2>/dev/null; rc=$?
+echo "still-alive rc=$rc"
+INNER
+)"
+    old_rc=$?
+    set -e
+    check_not_contains "old trap+wait idiom does not survive 254" "still-alive" "$old_out"
+    check_rc "old trap+wait idiom dies with 254" 254 "$old_rc"
+}
@@ -0,0 +1,129 @@
+#!/usr/bin/env bash
+set -euo pipefail
+# t-telegram-listener-singleton.sh — single-instance guard for the Telegram
+# listener daemon (flock on ${XDG_RUNTIME_DIR:-/tmp}/pos-telegram-listener.lock):
+#   (a) the first --run acquires the lock and reaches its poll loop;
+#   (b) a second --run on the same runtime dir fails fast (exit 1) with the
+#       exact single-instance message — no 409/getUpdates race;
+#   (c) the flock auto-releases when the first instance exits, so the next
+#       --run starts cleanly (systemd Restart=always path);
+#   (d) --status reports the lock through the same primitives.
+# Hermetic: stubbed curl (no network) + systemctl (no user bus), real
+# jq/flock/timeout, sandboxed XDG_RUNTIME_DIR + CONFIG_DIR.
+
+run_test() {
+    require_cmd jq "telegram singleton guard" || return 0
+    require_cmd flock "telegram singleton guard" || return 0
+    require_cmd timeout "telegram singleton guard" || return 0
+
+    local sandbox stubs cfg runtime home listener curl_log marker first_log
+    sandbox="$(mksandbox telegram-singleton)"
+    stubs="$sandbox/stubs"
+    cfg="$sandbox/cfg"
+    runtime="$sandbox/runtime"
+    home="$sandbox/home"
+    listener="$ROOT/bin/pos-communication-telegram-listener"
+    curl_log="$sandbox/curl.log"
+    marker="$sandbox/loop.started"
+    first_log="$sandbox/first.log"
+    mkdir -p "$stubs" "$cfg" "$runtime" "$home"
+    : > "$curl_log"
+
+    # Stub curl: never touches the network. getUpdates serves an empty batch
+    # forever (first call touches $marker so the test knows the daemon reached
+    # its poll loop — which only happens AFTER the lock was acquired and the
+    # config checks passed); everything else returns {ok:true}. The small
+    # sleep keeps the empty-poll loop from spinning while the test runs.
+    cat > "$stubs/curl" <<STUB
+#!/usr/bin/env bash
+printf 'curl %s\n' "\$*" >> "$curl_log"
+for a in "\$@"; do
+    case "\$a" in
+        *getUpdates*)
+            touch "$marker"
+            sleep 1
+            printf '%s' '{"ok":true,"result":[]}'
+            exit 0
+            ;;
+    esac
+done
+printf '%s' '{"ok":true}'
+STUB
+    chmod +x "$stubs/curl"
+
+    # Stub systemctl: deterministic exit 1 — --status must not reach the real
+    # user bus; the autostart line is not what this test asserts.
+    printf '#!/usr/bin/env bash\nexit 1\n' > "$stubs/systemctl"
+    chmod +x "$stubs/systemctl"
+
+    : > "$cfg/telegram_commands.env"
+    : > "$cfg/telegram_prefixes.env"
+
+    local common=(PATH="$stubs:/usr/bin:/bin" CONFIG_DIR="$cfg"
+        XDG_RUNTIME_DIR="$runtime" HOME="$home"
+        TELEGRAM_BOT_TOKEN=testbot TELEGRAM_CHAT_ID=456 TELEGRAM_OWNER_ID=123)
+
+    # ── (a) first instance acquires the lock and runs ──
+    rm -f "$marker"
+    env "${common[@]}" timeout 10 "$listener" --run >"$first_log" 2>&1 &
+    local first_pid=$!
+
+    local waited=0
+    until [ -e "$marker" ]; do
+        sleep 0.1
+        waited=$((waited + 1))
+        if [ "$waited" -ge 100 ]; then
+            printf '  FAIL  first listener never reached the poll loop (log below)\n'
+            cat "$first_log"
+            kill "$first_pid" 2>/dev/null || true
+            wait "$first_pid" 2>/dev/null || true
+            return 0
+        fi
+    done
+    printf '  PASS  first listener acquired lock and reached the poll loop\n'
+
+    test_run_env "${common[@]}" -- "$listener" --status
+    check_rc "status while daemon up exits 0" 0 "$TR_RC"
+    check_contains "status reports lock held while running" \
+        "listener:  running (single instance lock held)" "$TR_OUT"
+
+    # ── (b) second instance fails fast with the exact message ──
+    test_run_env "${common[@]}" -- timeout 3 "$listener" --run
+    check_rc "second instance fails fast (exit 1)" 1 "$TR_RC"
+    check_contains "second instance prints exact single-instance message" \
+        "ERROR: listener already running (single instance) — check: systemctl --user status pos-telegram-listener" \
+        "$TR_OUT"
+
+    # ── (c) lock releases when the first instance ends ──
+    kill "$first_pid" 2>/dev/null || true
+    wait "$first_pid" 2>/dev/null || true
+
+    test_run_env "${common[@]}" -- "$listener" --status
+    check_contains "status reports not running after first exits" \
+        "listener:  not running" "$TR_OUT"
+
+    rm -f "$marker"
+    env "${common[@]}" timeout 10 "$listener" --run >"$sandbox/third.log" 2>&1 &
+    local third_pid=$!
+
+    waited=0
+    until [ -e "$marker" ]; do
+        sleep 0.1
+        waited=$((waited + 1))
+        if [ "$waited" -ge 100 ]; then
+            printf '  FAIL  third listener never reached the poll loop (log below)\n'
+            cat "$sandbox/third.log"
+            kill "$third_pid" 2>/dev/null || true
+            wait "$third_pid" 2>/dev/null || true
+            return 0
+        fi
+    done
+    printf '  PASS  third listener starts cleanly after the lock was released\n'
+
+    kill "$third_pid" 2>/dev/null || true
+    wait "$third_pid" 2>/dev/null || true
+
+    test_run_env "${common[@]}" -- "$listener" --status
+    check_contains "status reports not running after third exits" \
+        "listener:  not running" "$TR_OUT"
+}
Author	SHA1	Message	Date
Your Name	59a4c0e1df	feat: add alias creation to pos system bank interactive menu gates / consistency-and-conventions (push) Successful in 26s Details New 'alias' subcommand (+ POS_SUBCMDS row, menu option 6 'Manage aliases'): create/update/list/remove bash aliases that run 'pos system bank run <name>', written into ~/.bashrc inside a managed marker block (BASH_RC_FILE seam for tests, atomic tmp+mv rewrite). - alias_valid_name enforces ^[a-zA-Z][a-zA-Z0-9_-]*$ - same-name create is an idempotent retarget; last alias removal cleans the whole block; outer ~/.bashrc aliases preserved byte-identically - outer-alias collision refused (file untouched), PATH-shadow non-blocking warn, 'bank remove' drops aliases pointing at the removed command - GNU sed '1,0p' edge case (block at line 1) fixed with guarded ranges; regex-quote literalization avoided via glob case payload match - t-bank.sh +49 checks (71 -> 120); docs: POS.md, howto/system.md, tests/README.md, AGENT_TODO.md; make gen byte-idempotent (also refreshes the pos-communication-telegram-listener filetable line count so the previous commit's tree is gen-consistent)	2026-09-12 13:53:44 -04:00
Your Name	fcfa2a569a	fix: stop telegram listener crash-loop from failed background commands gates / consistency-and-conventions (push) Failing after 13s Details A mapped command exiting non-zero (e.g. /capture -> ffmpeg with no webcam, exit 254) killed the whole daemon: the CHLD trap only recorded children that exited 0 (and wait -n inside a trap is unreliable on bash 5.2 anyway), so reap_commands fell back to a bare 'wait $pid' which aborts the shell under set -euo pipefail before the exit code is captured. systemd Restart=always then crash-looped (dead gaps + duplicate command execution from getUpdates offset=0 restarts). - reap_commands: single reaper path, set -e safe wait with \|\| rc=$?, non-zero child exits now produce a normal reply with the real rc - persist the confirmed getUpdates offset to $CONFIG_DIR/telegram-listener.state (LISTENER_STATE_FILE seam) and resume it on start, so a restart never re-delivers an unconfirmed burst - new regression test t-telegram-listener-reap.sh (12 checks): 254-child reap survives daemon, negative control proves the old idiom dies, offset load/save resume + invalid fallback + empty-batch no-write	2026-09-12 13:48:02 -04:00
Your Name	287f0b75b7	refactor: move command bank under system category, drop system alias tool gates / consistency-and-conventions (push) Successful in 21s Details - rename bin/pos-bank -> bin/pos-system-bank with # POS: system bank header; CLI becomes 'pos system bank'; BANK_FILE storage seam and v2 escaped format unchanged - delete bin/pos-system-alias; remove its POS.md/howto sections and the system-alias INTERACTIVE_CMDS entry; pos ai alias untouched - update bin/pos comment + usage example, completions (gen), docs, tests/t-bank.sh CLI path, AGENT_TODO Done notes	2026-09-12 11:13:41 -04:00
Your Name	59d834a71c	chore: note pos bank multiline fix in AGENT_TODO Done gates / consistency-and-conventions (push) Successful in 20s Details	2026-09-12 08:27:12 -04:00
Your Name	11b4a679a8	fix: store and execute multiline commands in pos bank gates / consistency-and-conventions (push) Successful in 20s Details bank.env is line-oriented (name\|description\|command) so commands with real newlines spanned records: bank_load truncated the command to its first line and the remaining script lines became bogus entries. The bank_get+cut -f3 retrieval path also truncated at embedded tabs. - lib/bank-lib.sh: v2 format escapes backslash->\\ and newline->\\n in the command field, writes # BANK_VERSION: 2; bank_load decodes with printf %b only for v2 files, so existing v1 files load raw (backward compatible, verified against the real ts-google entry). - bin/pos-bank: cmd_show/cmd_run/cmd_edit now read fields from the BANK_* arrays via bank_find instead of bank_get+cut. - tests/t-bank.sh: +13 checks (71 total) - multiline round-trip exact bytes, literal backslash-n, v1 raw-backslash compat, v1+re-save byte-identical, CLI show/run full script.	2026-09-12 08:25:40 -04:00
Your Name	e23d57e551	fix: include category-less tools in pos tab completion gates / consistency-and-conventions (push) Successful in 23s Details _pos_complete_categories offered only hyphenated categories plus a hardcoded 'config', so 'pos <TAB>' never showed bank/tree. Category-less tools are now discovered from the executable scan, and the words==3 dispatch routes no-hyphen tools to _pos_complete_tool so 'pos bank <TAB>' offers list/add/show/run/edit/remove.	2026-09-12 07:29:30 -04:00
Your Name	c5d501ad25	fix: show Command Bank in main pos menu; fix pos bank run crash gates / consistency-and-conventions (push) Successful in 27s Details - bin/pos: _pos_category_list now emits category-less tools (pos-bank, pos-config, pos-tree) as sorted menu entries with an empty subcommand column, deduped against real categories (pos-ai). bank previously never appeared in the bare 'pos' menu. - bin/pos-bank: fixed invalid 'local name="" -a cli_params=()' at cmd_run (line 150) — bash rejected '-a' after an assignment, crashing every 'pos bank run' with 'local: -a: not a valid identifier'. Split into 'local name=""' + 'local -a cli_params=()'. - tests/t-bank.sh: added B12-B14 covering cmd_run (no-params, missing-command, param substitution) — would have caught the crash. - AGENT_TODO.md: bank feature moved to Done.	2026-09-12 05:20:20 -04:00
Your Name	73d15a26b4	fix: register bank-lib.sh (and yt-lib.sh) in install/uninstall lib manifests gates / consistency-and-conventions (push) Successful in 19s Details lib/bank-lib.sh was added for pos bank but never registered in install.sh's phase-2 lib copy list, so it never reached /usr/local/bin and pos bank failed after install. Also restored yt-lib.sh to POS_LIBS (pre-existing gap: uninstall left it behind). Symmetry gate tests/t-uninstall-manifest.sh now passes.	2026-09-12 03:28:15 -04:00
Your Name	41efc91cf0	feat: add pos bank — persistent command bank with parameterized templates gates / consistency-and-conventions (push) Successful in 29s Details	2026-09-12 03:02:20 -04:00
Your Name	0b76d4d29e	fix: add lib/yt-lib.sh to install.sh library list gates / consistency-and-conventions (push) Successful in 17s Details The yt-lib.sh library was missing from the install script's library list, causing pos-media-yt-subtitles (and other yt-* tools) to fail with 'No such file or directory' when run from /usr/local/bin/. This adds yt-lib.sh to the install list and updates documentation to reflect the change.	2026-09-11 13:00:14 -04:00
Your Name	2c77e73799	. gates / consistency-and-conventions (push) Successful in 17s Details	2026-09-11 12:47:42 -04:00
Your Name	df1cca478d	fix: Telegram listener — async command execution + singleton guard gates / consistency-and-conventions (push) Successful in 23s Details Root cause: run_and_reply() blocked the entire listener synchronously. FFmpeg hung because child processes inherited stdin (waiting for 'q'). Long-running commands froze the listener for up to 120s. Fix: - Commands run in background with stdin=/dev/null, output to temp file - reap_commands() collects output non-blocking after each getUpdates cycle - SIGCHLD handler pre-caches exit codes via wait -n - TERM/INT trap kills background processes and cleans temp files - Singleton guard (flock) prevents duplicate listeners racing getUpdates Tests: - t-telegram-listener-exec.sh: 12 hermetic checks (echo, pipes, stderr, compound commands, long-running, quiet mode) - t-telegram-listener-singleton.sh: 8 checks (lock acquire/release/status) Architect verdict: accepted as-is, no re-architecture needed.	2026-09-09 17:17:56 -04:00
Your Name	f14d24950a	feat: pos media yt — unified YouTube tools + subtitles (POS--9) gates / consistency-and-conventions (push) Successful in 20s Details	2026-09-09 07:04:22 -04:00
Your Name	9a164462e7	feat: install.sh version gate — --force + per-commit 0.0cN gates / consistency-and-conventions (push) Successful in 33s Details Architect-approved (C): install.sh now skips+aborts (exit 0) when the installed version equals the current git-derived version, with a --force flag to re-install. Version scheme 0.0cN (N = git commit count) bumps by construction on every commit. - install_version(): derives 0.0c$count via git rev-list; empty when .git absent (gate skipped); INSTALL_VERSION_OVERRIDE presence-check seam for tests (empty override simulates no-git deterministically) - Gate after arg parse, before phases; numeric comparison (strip 0.0c, -eq); messages: 'Already installed (X). Use --force to re-install.' and '(dry-run) Would skip install: already at version X', both exit 0 - flag_set installed_version after 'Bootstrap complete' banner (not in dry-run, even under --force, never on phase failure) - Docs: SCRIPTS.md flag table + gate description, AGENT_Context line count 248->301 + flags + flow diagram, README --force row, tests/README row, AGENT_TODO Done entry Verified: new tests/t-install-version.sh 21 checks (9 contracted cases, real install.sh + hermetic env seams); suite 20 files / 461 checks / 0 fail / 0 skip; make gen byte-idempotent; make check OK; make lint 0 FAIL, 0 WARN; bash -n clean; git diff --check clean; Reviewer APPROVE_WITH_NOTES with 3 mutation disproofs (8/21, 9/21, 4/21 fail)	2026-09-08 10:17:31 -04:00