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Retrofit per the playbook. Resolve both AGENTS.md TODOs with verified facts (make-target set; db:seed is live at image-build + local dev), reconcile the AI-provider count (4 files -> 5 registered providers), and extract the AI subsystem cheat-sheet into docs/guides/ai-subsystem.md, lazy-loaded via a .claude/rules symlink with an index line in AGENTS.md. All AGENTS.md commands verified green (tests 177/177, build, tsc, lint).
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AI subsystem
Scoped guidance for the AI generation subsystem (proof-of-work/lib/ai/** and the
generate/generations route handlers). Whole-repo rules live in AGENTS.md.
Architecture
generate/route.tskicks off a detached background runner (generationRunner.ts) and returns an id; the client attaches via SSE (generations/[id]/stream) and can also poll the row. Navigating away does NOT cancel generation.- System prompt =
systemPromptBase.ts(output contract: JSON-only, libraryexerciseIds only, suggested weights) + the template's coaching prompt +PROGRAM_OUTPUT_SHAPE+ library + optional history block (historyContext.ts). - Multi-config:
AIConfigProfilerows per user;UserPreferences.activeAIConfigIdpoints at the active one and is mirrored into the legacyai*columns for back-compat.
Provider abstraction
- Each provider yields an async iterable of
GenerateChunk(text/usage/done/error); add new ones underlib/ai/providers/and register inindex.ts.openai.tsexports bothopenaiandopenai-compatible, so the four provider files register 5 providers (claude,openai,openai-compatible,gemini,ollama). - Streaming AI uses SSE; partial JSON is recovered with
lib/ai/lenientJson.ts. - Pricing/model menus live in
lib/ai/pricing.ts(PRICES,MODEL_MENU) — keep them paired so every menu model has a price entry (there's a test enforcing this).