[codex] Refresh GitHub beginners QA dependencies

[ootakazuhiko]

Summary

• Refresh QA/deploy dev dependencies (markdownlint-cli, markdown-link-check, and gh-pages) and audit-fix package-lock.json.
• Add a dependency audit step to Docs Quality Gate, include package-lock.json in its path trigger, and enable npm cache for root installs.
• Normalize existing table delimiter rows required by newer markdownlint MD060 in docs/ and matching manuscript/ appendices.
• Document Node.js 20.18.1+ / npm audit in README and ignore additional local Jekyll/Bundler/GitHub Pages artifacts.

Verification

• npm ci
• npm test
• npm run docs:quality-gate
• npm audit
• Bundler install with workspace-local BUNDLE_PATH / BUNDLE_APP_CONFIG
• bundle exec jekyll build --config docs/_config.yml --source docs --destination _site
• Built-site smoke for top page, chapter Git basics, chapter GitHub Actions, shortcut appendix, and resources appendix
• Workflow YAML parse for all .github/workflows/*.{yml,yaml}
• git diff --check

Notes

• Full npm audit improved from 10 vulnerabilities (4 moderate, 5 high, 1 critical) to 0.
• Jekyll build still emits Sass deprecation warnings from the existing minima theme dependency, but the build succeeds and this PR does not change that theme stack.

[ootakazuhiko]

@copilot review

このPRでは、QA/deploy devDependencies更新、npm audit 0件化、Docs Quality Gateへの監査追加、markdownlint MD060 に合わせた既存表区切り行の正規化、README/ignore整備を行っています。Jekyll build の Sass deprecation warning は既存 minima theme 由来で、ビルド自体は成功するため今回の修正対象外です。

[Copilot]

Pull request overview

This PR refreshes the repository’s Node-based QA/tooling dependencies and updates the Docs Quality Gate workflow to include dependency auditing, while also adjusting markdown tables in docs/manuscript to comply with newer markdownlint behavior and documenting the Node.js minimum required by transitive QA dependencies.

Changes:

• Bump QA/dev dependencies (markdownlint-cli, markdown-link-check, gh-pages) and update package-lock.json accordingly.
• Enhance .github/workflows/docs-quality-gate.yml with package-lock.json triggers, npm cache, and an npm audit step.
• Update README and ignore rules, plus normalize table delimiter rows in docs/manuscript appendices for markdownlint.

Reviewed changes

Copilot reviewed 3 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
README.md	Documents Node.js 20.18.1+ requirement and adds npm audit to the suggested verification commands.
package.json	Updates QA/dev dependency versions.
package-lock.json	Lockfile refresh reflecting dependency bumps and audit fixes.
manuscript/appendix-resources/index.md	Normalizes markdown table delimiter rows for lint compatibility.
manuscript/appendix-github-shortcuts/index.md	Normalizes markdown table delimiter rows for lint compatibility.
docs/appendices/appendix-resources/index.md	Normalizes markdown table delimiter rows for lint compatibility.
docs/appendices/appendix-github-shortcuts/index.md	Normalizes markdown table delimiter rows for lint compatibility.
.gitignore	Ignores additional Jekyll/Bundler/GitHub Pages local artifacts.
.github/workflows/docs-quality-gate.yml	Adds package-lock.json path triggers, enables npm cache, and runs npm audit.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[ootakazuhiko]

マージ前確認を完了しました。

ローカル検証:

• npm ci
• npm test
• npm run docs:quality-gate
• npm audit（0 vulnerabilities）
• workspace-local Bundlerで bundle install
• bundle exec jekyll build --config docs/_config.yml --source docs --destination _site
• built-site smoke（top / Git basics / GitHub Actions / shortcut appendix / resources appendix）
• workflow YAML parse
• git diff --check

CI / Review:

• PR head: 1e1fe6f6c2de1913f792a2e6507bbd1cb74c0ed1
• Docs Forbidden Check 26944288514: success
• Docs Quality Gate 26944288555: success
• Book QA 26944288551: success
• Copilot PR reviewer: review本文のみ、生成コメントなし
• Copilot cloud agent: run 26944521932 success
• pr-review-completeness: status=ok, reviews=1, review_comments=0, review_threads=0, unresolved_threads=0, generated_count_mismatches=0, missing_review_ids=0

備考:

• npm audit は 10件（moderate 4 / high 5 / critical 1）から 0件へ改善しました。
• Jekyll build の Sass deprecation warning は既存 minima theme stack 由来で、ビルドは成功しています。