[ci] Allow Claude GitHub Action to run pnpm check and tests

[penalosa]

Updates the Claude GitHub Action workflow to:

• Set up pnpm and Node.js with caching
• Install dependencies
• Allow Claude to run pnpm check and pnpm test:ci --filter <package>
• Add custom instructions to ensure tests are always run with --filter to avoid running the entire monorepo's test suite

---

• Tests

  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because: CI workflow configuration change

• Public documentation

  • Cloudflare docs PR(s):
  • Documentation not necessary because: Internal CI tooling change

---

[changeset-bot]

⚠️ No Changeset found

Latest commit: ba72b06

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 4 additional flags.

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commit: ba72b06

[vicb]

What if the change is in a leaf package?

[penalosa]

What do you mean?