refactor: use gray-matter for parsing frontmatter

[danielroe]

No description provided.

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Project	Deployment	Actions	Updated (UTC)
npmx.dev	Ready	Preview, Comment	Feb 7, 2026 8:01pm
npmx.dev-vercel	Ready	Preview, Comment	Feb 7, 2026 8:01pm

2 Skipped Deployments

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request replaces the custom frontmatter parsing in modules/standard-site-sync.ts with the gray-matter library, switching from a readFileSync + parseBasicFrontmatter flow to using gray-matter's read and taking frontmatter from the result's data property. The parseBasicFrontmatter unit test file was removed. The project dependency gray-matter@4.0.3 was added. Other synchronisation logic (normalisation, validation, hashing, downstream PUT) is unchanged.

Possibly related PRs

• test: add tests for parse-basic-frontmatter #961: Contains additions/enhancements to tests and typings for parseBasicFrontmatter which directly conflict with this PR's removal of the custom parser and its tests.

🚥 Pre-merge checks | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The pull request lacks any description from the author, making it impossible to assess the stated intent or rationale for the changes.	Add a pull request description explaining the purpose of replacing the custom frontmatter parser with gray-matter, including benefits and any breaking changes or migration notes.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch refactor/graymatter

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