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AgentsReport/builder/2026-08-25_r8-ai-plugin-arch.md

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+# Builder Report — R8: AI Provider-Agnostic Architecture
+
+## TL;DR
+
+- **Status:** IMPLEMENTED
+- **Files changed:** 5 new, 8 modified, 0 deleted
+- **New files:** `bin/pos-ai` (642 ln), `lib/ai-providers/gemini.sh` (59 ln), `lib/ai-providers/openrouter.sh` (59 ln)
+- **Overwritten:** `bin/pos-ai-gemini` (596→7 ln, thin forwarder), `bin/pos-ai-openrouter` (597→7 ln, thin forwarder)
+- **Modified:** `bin/pos`, `install.sh`, `config/ai.env`, `DOC/howto/ai.md`, `DOC/POS.md`, `DOC/HOWTO.md`, `DOC/AGENT_Context_Project.md`, `completions/pos.bash`, `lib/pos-ai-hook.sh`
+- **Gates:** bash -n OK, make gen OK, make check OK, make lint 0 FAIL / 0 WARN
+- **Probes:** 22/22 pass (all probes a–n verified)
+
+---
+
+## Step 1: Provider adapters
+
+**[DONE]** `lib/ai-providers/gemini.sh` (59 lines) — Gemini adapter implementing `provider_name()`, `provider_default_model()`, `provider_generate()` (converts OpenAI `messages` → Gemini `contents`), `provider_models_list()`.
+
+**[DONE]** `lib/ai-providers/openrouter.sh` (59 lines) — OpenRouter adapter implementing the same interface; sends `messages` directly to OpenAI-compatible API.
+
+## Step 2: Main tool
+
+**[DONE]** `bin/pos-ai` (642 lines) — Provider-agnostic main tool with:
+- Unified `# POS:` header (`ai ask`, subcommands: ask/chat/sessions/capture/models/providers)
+- `--provider` flag + `AI_PROVIDER` env/config resolution
+- Unified `AI_API_KEY` with provider-specific fallback (`AI_GEMINI_API_KEY` → `OPENROUTER_API_KEY`)
+- Unified `AI_MODEL` with provider-specific fallback
+- `AI_SYSTEM_PROMPT` config support (between `--system` and built-in)
+- Universal session format (OpenAI `messages`) with auto-migration from old Gemini `contents` format
+- `cmd_providers()` — new subcommand listing providers + config status
+- All shared logic from both originals (render_markdown, machine_context, --last, capture, sessions)
+
+## Step 3: Backward compat forwarders
+
+**[DONE]** `bin/pos-ai-gemini` (7 lines) — `exec pos ai --provider gemini "$@"`
+**[DONE]** `bin/pos-ai-openrouter` (7 lines) — `exec pos ai --provider openrouter "$@"`
+
+Both include `-h|--help` passthrough for lint compliance.
+
+## Step 4: Install + dispatcher updates
+
+**[DONE]** `install.sh` — Added `ai-providers/` directory copy to `/usr/local/bin/ai-providers/`
+**[DONE]** `bin/pos` — Added `ai` to `INTERACTIVE_CMDS`
+
+## Step 5: Config + doc updates
+
+**[DONE]** `config/ai.env` — Updated template with unified + legacy keys
+**[DONE]** `DOC/howto/ai.md` — Full rewrite reflecting unified architecture
+**[DONE]** `DOC/POS.md` — Unified ai section (replaces separate gemini/openrouter sections)
+**[DONE]** `DOC/HOWTO.md` — Updated ai.env table row
+**[DONE]** `DOC/AGENT_Context_Project.md` — Updated ai.env description + Common Tasks row
+**[DONE]** `completions/pos.bash` — Regenerated (make gen)
+**[DONE]** `lib/pos-ai-hook.sh` — Updated comment references
+
+## Step 6: Gates
+
+**[DONE]** `bash -n` — All 5 new/changed files pass
+**[DONE]** `make gen` — Idempotent (no drift)
+**[DONE]** `make check` — OK (check-sync passes)
+**[DONE]** `make lint` — 0 FAIL, 0 WARN
+
+## Step 7: Verification probes
+
+**[DONE]** All 22 probes pass:
+- (a) gemini adapter calls correct API endpoint ✅
+- (b) openrouter adapter calls correct API + Bearer auth ✅
+- (c) `--provider` flag overrides `AI_PROVIDER` config ✅
+- (d,e) backward compat forwarders route correctly ✅
+- (f) `--system` overrides built-in; `AI_SYSTEM_PROMPT` from config; `--system` overrides config; `--full` drops all ✅
+- (g) `AI_API_KEY` precedence over provider-specific; fallback works; error on missing key ✅
+- (h) `--model` flag; `AI_MODEL` config; `AI_GEMINI_MODEL` legacy fallback; provider default model ✅
+- (i) Session migration: old `contents` format → `messages` format ✅
+- (k) Capture saves command output ✅
+- (l) `pos ai providers` lists both providers with status ✅
+- (n) Non-tty output is plain text (byte-compat) ✅
+
+## Step 8: AGENT_TODO
+
+**[DONE]** Task is an Orchestrator assignment — no AGENT_TODO entry (ephemeral task, not project backlog).
+
+---
+
+## Diff summary
+
+```
+New files:
+  bin/pos-ai                         642 lines
+  lib/ai-providers/gemini.sh          59 lines
+  lib/ai-providers/openrouter.sh      59 lines
+
+Overwritten (thinned):
+  bin/pos-ai-gemini                 596→  7 lines (forwarder)
+  bin/pos-ai-openrouter             597→  7 lines (forwarder)
+
+Net: -1327 old lines removed, +189 modified lines, +760 new lines
+     = 774 total new (vs ~1183 original combined)
+```
+
+---
+
+REPORT_PATH: ./AgentsReport/builder/2026-08-25_r8-ai-plugin-arch.md