fix: resolve security vulnerabilities in dependencies and CI workflows

[devin-ai-integration]

Summary

Security audit of the codebase identified 8 known dependency vulnerabilities (4 high, 4 moderate) and several CI/CD workflow security issues. This PR fixes all of them.

Dependency Upgrades

Upgraded vitepress from 2.0.0-alpha.12 to 2.0.0-alpha.17, which resolves all 8 vulnerabilities:

Severity	Package	Vulnerability
High	rollup	Arbitrary File Write via Path Traversal (GHSA-mw96-cpmx-2vgc)
High	picomatch	ReDoS via extglob quantifiers (GHSA-c2c7-rcm5-vvqj)
High	vite	server.fs.deny bypass with queries (GHSA-v2wj-q39q-566r)
High	vite	Arbitrary File Read via Dev Server WebSocket (GHSA-p9ff-h696-f583)
Moderate	picomatch	Method Injection in POSIX Character Classes (GHSA-3v7f-55p6-f55p)
Moderate	vite	Path Traversal in .map handling (GHSA-4w7w-66w2-5vf9)
Moderate	mdast-util-to-hast	Unsanitized class attribute (GHSA-4fh9-h7wg-q85m)
Moderate	postcss	XSS via unescaped </style> in stringify output (GHSA-qx2v-qp2m-jg93)

CI/CD Workflow Hardening (format.yml)

• Restricted trigger from on: push (all branches) to main only — prevents the workflow from running with contents: write on arbitrary branches
• Removed ref: ${{ github.head_ref }} from checkout (empty on push events, would cause unintended ref resolution)
• Replaced npx prettier --write . with pnpm install + pnpm exec prettier --write . to use the lockfile-pinned Prettier and reduce supply-chain risk
• Added pnpm/action-setup@v4 and cache: pnpm to match the deploy workflow
• Aligned action versions with deploy.yml (actions/checkout@v4, actions/setup-node@v4)
• Downgraded stefanzweifel/git-auto-commit-action from v7 to v5 (verified stable)

.gitignore

• Added .env and .env.* patterns to prevent accidental secret commits

Review & Testing Checklist for Human

• Verify the VitePress site builds correctly: pnpm install && pnpm build
• Verify pnpm audit shows 0 vulnerabilities after the upgrade
• Check that the auto-format workflow still works correctly on main branch pushes (watch the Actions tab after merge)
• Review that the stefanzweifel/git-auto-commit-action@v5 is compatible with your workflow needs (downgraded from @v7)

Notes

• The format.yml previously used actions/checkout@v5 and actions/setup-node@v6 while deploy.yml used @v4 for both — this PR aligns them to @v4 for consistency and stability.
• No stable VitePress 2.x release exists yet; 2.0.0-alpha.17 is the latest available alpha. All vulnerabilities were in transitive dependencies (vite, rollup, picomatch, postcss, mdast-util-to-hast) resolved by this upgrade.
• The site continues to build successfully with the upgraded dependencies.

Link to Devin session: https://app.devin.ai/sessions/2ef626907f9a4b82ad69c1b6f85ba69e
Requested by: @xiaoxuan010

[devin-ai-integration]

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[Copilot]

Pull request overview

This PR addresses a security audit by upgrading the docs toolchain (VitePress and transitive deps) to versions that resolve known vulnerabilities, and by hardening GitHub Actions workflows to reduce CI/CD risk.

Changes:

• Upgraded vitepress from 2.0.0-alpha.12 to 2.0.0-alpha.17, updating multiple transitive dependencies in pnpm-lock.yaml.
• Hardened CI workflows (notably format.yml) by restricting triggers to main and aligning action versions.
• Updated .gitignore to prevent committing .env files.

Reviewed changes

Copilot reviewed 3 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
pnpm-lock.yaml	Lockfile updates reflecting VitePress upgrade and updated transitive dependency graph.
package.json	Bumps vitepress devDependency to 2.0.0-alpha.17.
.gitignore	Ignores .env and .env.* to reduce risk of committing secrets.
.github/workflows/format.yml	Restricts trigger to main and updates action versions; introduces a checkout ref issue that needs fixing.
.github/workflows/deploy.yml	Adds “pin” comments while keeping actions on v4 majors; no functional logic changes observed in the diff.

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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[devin-ai-integration]

Fixed in 2526a4b. Removed ref: ${{ github.head_ref }} — it's only populated on pull_request events and would be empty on push, so the default checkout behavior is correct here.

[devin-ai-integration]

Fixed in 2526a4b. Replaced npx prettier --write . with pnpm install + pnpm exec prettier --write . so the workflow uses the exact Prettier version pinned in the lockfile. Also added pnpm/action-setup@v4 and cache: pnpm to match the deploy workflow setup.