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)

lib/tests/fast-libs.test.sh

@@ -0,0 +1,52 @@
+#!/usr/bin/env bash
+# lib/tests/fast-libs.test.sh — fast-libs.sh verbs + ctx7-reminder hook (BDR-078)
+set -u
+ROOT="$(cd "$(dirname "$0")/../.." && pwd)"
+L="$ROOT/lib/fast-libs.sh"
+H="$ROOT/hooks/ctx7-reminder.sh"
+pass=0; fail=0
+check() { if [ "$2" = "$3" ]; then pass=$((pass+1)); else fail=$((fail+1));
+  printf 'FAIL %s: got[%s] want[%s]\n' "$1" "$2" "$3"; fi; }
+
+tmp="$(mktemp -d)"; trap 'rm -rf "$tmp"' EXIT
+
+# --- detect: JS fast-libs matched, stable deps ignored ---
+mkdir -p "$tmp/js"
+cat > "$tmp/js/package.json" <<'EOF'
+{"dependencies":{"react":"^19","express":"^5","@tanstack/react-query":"^5"},
+ "devDependencies":{"vite":"^6","lodash":"^4"}}
+EOF
+check T1-js-detect "$(bash "$L" detect "$tmp/js" | tr '\n' ' ')" \
+  "@tanstack/react-query react vite "
+
+# react-icons must NOT ride the react match (anchored full-key)
+mkdir -p "$tmp/near"
+printf '{"dependencies":{"react-icons":"^5","express":"^5"}}' \
+  > "$tmp/near/package.json"
+check T2-near-miss "$(bash "$L" detect "$tmp/near" >/dev/null 2>&1; echo $?)" 1
+
+# --- detect: python manifest + stable-tech project (exit 1) ---
+mkdir -p "$tmp/py"
+printf 'fastapi==0.115\nrequests>=2\n' > "$tmp/py/requirements.txt"
+check T3-py-detect "$(bash "$L" detect "$tmp/py")" "fastapi"
+mkdir -p "$tmp/cpp"
+check T4-none "$(bash "$L" detect "$tmp/cpp" >/dev/null 2>&1; echo $?)" 1
+
+# --- cache-status: missing / fresh / stale ---
+check T5-missing "$(bash "$L" cache-status "$tmp/js" || true)" missing
+mkdir -p "$tmp/js/.ctx7-cache"; touch "$tmp/js/.ctx7-cache/react-core.md"
+check T6-fresh "$(bash "$L" cache-status "$tmp/js")" fresh
+touch -d '10 days ago' "$tmp/js/.ctx7-cache/react-core.md"
+check T7-stale "$(bash "$L" cache-status "$tmp/js" || true)" stale
+
+# --- hook: fires once per session, silent on stable projects ---
+hook() { printf '{"prompt":"add a hook","session_id":"%s","cwd":"%s"}' \
+  "$1" "$2" | TMPDIR="$tmp" bash "$H"; }
+check H1-fires "$(hook s1 "$tmp/js" | grep -c 'Fast-moving')" 1
+check H2-once "$(hook s1 "$tmp/js" | wc -l)" 0
+check H3-cpp-quiet "$(hook s2 "$tmp/cpp" | wc -l)" 0
+check H4-notif-quiet \
+  "$(printf '{"prompt":"<task-notification>x","session_id":"s3","cwd":"%s"}' \
+    "$tmp/js" | TMPDIR="$tmp" bash "$H" | wc -l)" 0
+
+printf 'PASS=%s FAIL=%s\n' "$pass" "$fail"; [ "$fail" -eq 0 ]