feat(ctx7): coverage extension — fast-libs single source + reminder hook + executor briefs (BDR-078)

- lib/fast-libs.sh: detect/cache-status verbs, JS+Python manifests,
  7-day cache freshness, LC_ALL=C sort — replaces 3 hardcoded lists
  (ship-feature 0c, init-project 5c, onboard 3.5)
- hooks/ctx7-reminder.sh: once-per-session UserPromptSubmit nudge when
  the project carries fast-libs and .ctx7-cache/ is missing/stale
- find-docs: before-writing-code trigger + cache-first rule; dist is
  machine-owned (gitignored) so the durable patch lives in
  install-plugins.sh STEP ctx7 (idempotent, grep-guarded)
- feater/bugfixer briefs: fast-lib docs rule (fresh cache read, else
  2-topic ctx7 fetch, else NOTES cache miss + proceed)
- tests: lib/tests/fast-libs.test.sh (11 checks); shellcheck + full
  make test green (review-guards 5/0)

skills/onboard/SKILL.md

@@ -207,13 +207,10 @@ ls .ctx7-cache/ 2>/dev/null
 ```
 
 ### Détection fast-libs
-Parse manifests selon l'archétype :
-- **nextjs-app-router** → chercher : next, react, prisma, @supabase/*, drizzle-orm, next-auth, @clerk/*
-- **react-spa** → chercher : react, @tanstack/*, zustand, jotai
-- **rest-api-node** → chercher : fastify, @nestjs/*, prisma, drizzle-orm
-- **rest-api-python** → chercher : fastapi, pydantic, sqlalchemy (si ≥ 2.0)
-- **astro-static** → chercher : astro, @astrojs/*
-- **wordpress / cli-tool / library / dotfiles-meta / static-html** → souvent aucune fast-lib, audit léger
+Source unique : `bash ~/.claude/lib/fast-libs.sh detect .` (deps JS/TS via
+package.json + Python via requirements/pyproject — liste centralisée,
+BDR-078). Archétypes wordpress / cli-tool / library / dotfiles-meta /
+static-html → souvent aucune fast-lib, audit léger.
 
 ### Vérification cache
 Pour chaque fast-lib détectée :