ci: add Gitea Actions gate (make gen/check/lint on push/PR)

- .gitea/workflows/lint.yml: on push + pull_request runs make gen, then
  git diff --exit-code (gen-drift check), then make check, then make lint
- requires a registered act_runner (ubuntu-latest label) to execute
- docs: AGENTS.md Quick facts 'no CI' -> CI bullet (runner required, gates
  still run locally); DEV.md stub-harness note clarifies CI is static-gates
  only; AGENT_TODO Done entry + Next item for runner registration
- verified locally: gen idempotent (0 gen-managed files changed), check OK,
  lint 0 FAIL / 0 WARN

AGENT_TODO.md

@@ -14,8 +14,14 @@ summary (newest last).
 - When a task is completed: move it from Now/Next into **Done** (dated one-line)
   in the same commit that finishes the work.
 
+## Next
+
+- Register a Gitea **act_runner** on `gitea.skink-platy.ts.net` (Docker: `gitea/act_runner` with a `ubuntu-latest` label) so `.gitea/workflows/lint.yml` actually runs — until a runner connects, the gate stays queued and local `make lint` remains the only enforcement.
+
 ## Done
 
+- **2026-08-14** — Gitea Actions gate added: `.gitea/workflows/lint.yml` runs `make gen` + `git diff --exit-code` (gen-drift) + `make check` + `make lint` on every push/PR. Verified locally the exact four steps pass (gen idempotent, check OK, lint 0 FAIL / 0 WARN). "no CI" lines updated in AGENTS.md (Quick facts → CI bullet, notes a registered act_runner is required) and DEV.md (stub harnesses note: CI runs static gates only, not behaviour suites). Gitea 1.26.4 confirmed reachable; runner setup still pending (see Next).
+
 - **2026-08-14** — Convention-drift maintenance fix session (completed the audit backlog `MAINTENANCE.md`, M-001..M-023, all VERIFIED; gate `scripts/lint-conventions.sh` + `make lint` now 0 FAIL / 0 WARN; `make gen && make check` green). P0 bugs: M-002/003/004 added `docker-compose docker-vbox network-hotspot` to `INTERACTIVE_CMDS` (stdin/log-pipe prompt swallow); M-005 `install.sh --steps` now expands documented `N-M` ranges via `normalize_steps_spec()` (dry-run verified); M-006 feature-vs-docs decision: `--send`/`--markdown` **not restored** (health is a console-only reporter by design since fe7708f; scheduler `NOTIFY=always` covers delivery) — 5 docs corrected instead; M-007 `lib/notify.sh:57` fallback routed to stderr (stdout-leak on standalone source). P1: M-008..M-014 deps guards moved **before** `-h|--help` in docker-health/docker-ps (converted to `command -v X || err`), network-scan, share-usb-server, media-mp3/mp4 (guards before help with a `--dry-run` pre-scan preserving the documented no-deps preview); system-health documented as the sanctioned graceful-degradation no-guard pattern in DEV.md — lint refined accordingly (`first_guard_line` only matches real guards; `first_line` skips comments; precision fixes, not weakenings); M-015 system-firewall gained `usage()`+`-h|--help` (root-gated first; verified via sudo); M-016 `ffmpeg` added to preinstall PACKAGES. P2: M-017/M-018 autostart + usb-automount gained the feature-template preamble (flags.sh load, usage); M-019 `chmod +x apps/media/scrcpy.sh`; M-020 `SCALE_DIR`/`CONFIG_ENV` `:-` seams in pos-docker-compose (verified via overrides; follow-on fix: `DIM` color var missing from common.sh crashed `pos docker compose config` — added it); M-021 `CONFIG_DIR` centralized as the canonical XDG-aware seam in common.sh, per-file duplicates dropped (standalone-sourced notify.sh/config-ui.sh/matrix+telegram tools keep an identical guarded copy — "no shared lib? inline fallbacks"); M-022 `plugin_*` prefix collision resolved by renaming the internal registry helpers to `ent_plugin_*` (the documented plugin-authoring API `plugin_have`/`plugin_require`/`plugin_load_config`/`plugin_http_json` kept for user plugins); M-023 six tools (pos-config, pos-tree, pos-entertainment-{config,enable,disable,status}) now filename-referenced in DOC/POS.md. Hand-maintained AGENT_Context line-count rows bumped (install.sh 223→248, preinstall 75→76, common.sh 144→151, notify.sh 76→87 stale-corrected, autostart 14→50, usb-automount 134→138); `make lint` target wired in the Makefile. `MAINTENANCE.md` kept as the working record (uncommitted by design).
 
 - **2026-08-13** — `pos communication scrcpy` audio control: scrcpy already forwards device audio to the desktop by default (answer: yes, default is sound-to-desktop). Added `SCRCPY_AUDIO` config key (`pos config scrcpy`, default `true`): `false`/`no`/`0` → `--no-audio`, `true`/`yes`/`1` → nothing (default), anything else → error. Docs: POS_CONFIG header, POS.md config table, howto/communication.md Mirror section, HOWTO.md env row. Verified: harness +7 tests (47/47 green — false/true/yes/0/invalid/combined-order), `bash -n`, `make gen && make check` green.