Fix workflow_call checkout for target PR branch

[strawgate]

Summary

• add an explicit gh pr checkout "$PR_NUMBER" step in gh-aw-mention-in-pr-by-id so workflow_call/workflow_dispatch runs reliably operate on the target PR branch
• keep existing PR context fetch behavior intact while ensuring branch checkout is not skipped outside pull_request event contexts
• recompile .lock.yml to include the generated workflow change

Test plan

• run make compile
• verify source workflow diff includes checkout step
• verify lock workflow contains compiled checkout step

Made with Cursor

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: cb92499a-4c8c-4d40-b285-00bae74d76e4

📥 Commits

Reviewing files that changed from the base of the PR and between 1af62ce and 0b28501.

📒 Files selected for processing (2)

• .github/workflows/gh-aw-mention-in-pr-by-id.lock.yml
• .github/workflows/gh-aw-mention-in-pr-by-id.md

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📝 Walkthrough

Walkthrough

Updates the gh-aw-mention-in-pr workflow to include an explicit step that checks out the target PR branch using the GitHub CLI. The step sets GH_TOKEN and PR_NUMBER environment variables, then executes gh pr checkout to switch the workspace to the target PR branch. Changes span the workflow lock file and corresponding documentation.

Suggested labels

small_boom

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/workflow-call-checkout-target-pr

• 🛠️ Update Documentation: Commit on current branch
• 🛠️ Update Documentation: Create PR

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