Add theme CI gate and agent docs

[aileen]

Summary

• add a stable All tests pass gate to the pull request test workflow
• add concise AGENTS.md guidance for theme development boundaries and validation
• add CLAUDE.md as a symlink to AGENTS.md

Validation

• Ruby YAML parse over .github/workflows/*.yml
• verified CLAUDE.md points to AGENTS.md

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: cb8b2807-f3d5-43ea-9c61-d61e02f8276a

📥 Commits

Reviewing files that changed from the base of the PR and between 8ef2362 and 9a7f685.

📒 Files selected for processing (3)

• .github/workflows/test.yml
• AGENTS.md
• CLAUDE.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch aileen/add-theme-ci-agent-docs

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