fix(review): address review findings (guardrails, prompts, tests, docs)

- permission-gate: block refs/tags/v* pushes, rm -r -f separated flags,
  git reset --hard, git clean (verified against actual bypasses)
- prompts: /bugfix /feature /review no longer hardcode go-standards —
  reference profile-gated <lang>-standards instead
- company-context: drop hardcoded Go stack, note TRACKER_URL priority,
  warn on context truncation instead of silently dropping rules
- repo-map/docs-map: graceful degradation when config values are TODO
- /kit-doctor: warn on unfilled config fields (repoMap/trackerUrl/docsUrl)
- audit: retry POSTs to endpoint (3 attempts, backoff), still best-effort
- install.sh: remove TODO course URL from cheat sheet
- tests: expand guardrails (43 node checks), add shell tests for create-mr.sh
  (scp/https origin parse, GITLAB_HOST override, protected branch refusal),
  cover company-context lib (normalize/fetch/truncation) and mcp-bridge
- commit package-lock.json for reproducible installs
- document npm test Node >= 22.6 requirement (type stripping)

.gitignore

@@ -1,4 +1,3 @@
 node_modules/
 *.log
 .DS_Store
-package-lock.json