Added archive export ignores for theme packages

[aileen]

Summary

• adds package-level .gitattributes files to all subtree-published themes
• excludes AGENTS.md, CLAUDE.md, pnpm-workspace.yaml, and .gitattributes from GitHub-generated source archives
• keeps the files tracked in the monorepo and standalone theme source checkouts

Why

The standalone theme README download links use GitHub source archives such as archive/main.zip. Those archives are generated from the repository contents, not from the theme Gulp zipper, so repo-management files need export-ignore rules at the standalone repo root after subtree sync.

Validation

• git check-attr export-ignore reports set for all target files across all 16 theme packages
• simulated a Solo git archive and confirmed the target files are omitted

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 76501160-0ba6-432c-8bf5-d373d99f4371

📥 Commits

Reviewing files that changed from the base of the PR and between 4712fa0 and e42491a.

📒 Files selected for processing (16)

• packages/alto/.gitattributes
• packages/bulletin/.gitattributes
• packages/dawn/.gitattributes
• packages/digest/.gitattributes
• packages/dope/.gitattributes
• packages/ease/.gitattributes
• packages/edge/.gitattributes
• packages/edition/.gitattributes
• packages/episode/.gitattributes
• packages/headline/.gitattributes
• packages/journal/.gitattributes
• packages/london/.gitattributes
• packages/ruby/.gitattributes
• packages/solo/.gitattributes
• packages/taste/.gitattributes
• packages/wave/.gitattributes

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Walkthrough

Identical export-ignore attribute entries are added to the .gitattributes file of 16 theme packages: alto, bulletin, dawn, digest, dope, ease, edge, edition, episode, headline, journal, london, ruby, solo, taste, and wave. Each file gains four lines marking /AGENTS.md, /CLAUDE.md, /pnpm-workspace.yaml, and /.gitattributes as export-ignore, which excludes those paths from git archive and similar export operations.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: adding .gitattributes files with export-ignore rules to theme packages for archive exclusions.
Description check	✅ Passed	The description is clearly related to the changeset, providing context about why the .gitattributes files were added and how they prevent files from being included in GitHub source archives.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch aileen/theme-archive-export-ignore

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_{Comment @coderabbitai help to get the list of available commands and usage tips.}