Add GitHub workflow to enforce PR target branch policy

[tomquist]

Summary

This PR adds a new GitHub Actions workflow that automatically enforces a branch targeting policy, requiring contributors to target the develop branch instead of main for pull requests.

Key Changes

• Added .github/workflows/enforce-pr-target.yml workflow that:
  • Triggers on pull request events (opened, reopened, edited, synchronize) targeting main
  • Automatically requests changes on PRs from non-maintainers that target main
  • Provides clear instructions for contributors on how to retarget their PR to develop
  • Includes guidance on rebasing branches if needed
  • Prevents duplicate bot reviews using a marker comment
  • Allows maintainers (owners, members, collaborators) to bypass the check for release PRs and other special cases
  • Uses concurrency controls to serialize checks per PR and prevent race conditions

Implementation Details

• The workflow uses pull_request_target to safely access PR context with write permissions
• Deduplication logic checks for existing "CHANGES_REQUESTED" reviews from the bot before creating a new one
• The check fails the workflow but does not close the PR, allowing it to be fixed and automatically cleared
• Includes helpful bash commands for contributors to rebase their branches onto develop

https://claude.ai/code/session_01PwHHfg6c1QV7o1pzWgd7gw

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 00949ff6-66ec-47aa-857c-9a9da37d9013

📥 Commits

Reviewing files that changed from the base of the PR and between be29bd8 and de970d1.

📒 Files selected for processing (1)

• .github/workflows/enforce-pr-target.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/keen-planck-5ssLC

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