- Add ready_for_review and closed event types to pull_request trigger
- Update concurrency group to use PR number for proper cancellation
- Add condition to skip draft PRs and closed events
- When a PR is merged, the closed event triggers cancellation of
in-progress runs

https://claude.ai/code/session_0131m7Y5ac6ztV6iPCiW6zMU

#skip-bb
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<!-- This is an auto-generated description by cubic. -->
---
## Summary by cubic
Update CI to cancel in-progress runs when a PR is merged and use per-PR
concurrency for accurate cancellation. Draft PRs now run; only closed
events are skipped.

- **Refactors**
  - Listen to closed in the pull_request trigger.
  - Use PR number in the concurrency group for proper cancellation.
  - Add a job condition to skip closed events only.

<sup>Written for commit fe1d8903f8730bbf6ed93dbdfc8a9f0b804b9912.
Summary will update on new commits.</sup>

<!-- End of auto-generated description by cubic. -->

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Co-authored-by: Claude <noreply@anthropic.com>