Fix consistency and sequencing findings in lessons 01-05

Fix methodological audit findings in lessons 01-05

Drop the lesson map step from the lesson flow

Remove Evidence block from the course

Fix npm audit vulnerabilities in dev toolchain

Add text style standard and de-synthetic exemplar rewrites

Fix lesson completion button (short reflection + return to map)

Update project documentation to current state

Add miniproject, cheatsheet, course UI, GitVerse CI gate

Fix config accuracy and onboarding (re-review round)

Add agent metrics lesson, weave in AIPDLC concepts

Strengthen lessons to canonical standard, add SDD thread

Add course validator and authoring docs

docs: record full reindex timing (1065 sources, ~20 min) and track hung-embed shutdown issue

fix: exit server when MCP client closes stdin — EOF sets SHUTDOWN_EVENT

refactor: finish P2 — parse SEARCH_EXTENSIONS, hash per source, robust read_json, drop dead remove_by_dir

perf: debounce watchdog events — queue by path, async processing, hash-skip reindex

fix: cooperative shutdown for background reindex — stop embedding/writing on SHUTDOWN_EVENT

feat: validate OPENROUTER_API_KEY at startup — fail fast with clear message

docs: require agents to keep documentation in sync with every change

docs: clarify behavior without API key — server logs errors, does not crash

docs: fix stale module docstring (OpenRouter, minimal deps) and link to docs/

docs: add project documentation in docs/ and align README as entry point

perf: FTS5 keyword prefilter for query (RAG_FTS_PREFILTER) with adaptive fallback and stdlib optimizations