[gh-aw] Protected Files: Preserve type aliases in match | null refinement

[github-actions]

Warning

Protected Files

The push to pull request branch was blocked because the patch modifies protected files.

Target Pull Request: #19745

Please review the changes carefully before pushing them to the pull request branch. These files may affect project dependencies, CI/CD pipelines, or agent behaviour.

Protected files

• global.json

• .github/aw/actions-lock.json
• .github/workflows/agentic-state-machine.lock.yml
• .github/workflows/aw-auto-update.lock.yml
• .github/workflows/labelops-flake-fix.lock.yml
• .github/workflows/labelops-pr-maintenance.lock.yml
• .github/workflows/labelops-pr-security-scan.lock.yml
• .github/workflows/labelops-pr-security-scan.md
• .github/workflows/regression-pr-shepherd.lock.yml
• .github/workflows/repo-assist.lock.yml
• .github/docs/state-machine.md
• .github/workflows/labelops-pr-maintenance.md
• .github/workflows/aw-auto-update.md
• .github/agents/expert-reviewer.md
• .github/skills/reviewing-compiler-prs/SKILL.md

---

Apply the patch after review

The patch is available in the workflow run artifacts:

Workflow Run: View run details and download patch artifact

# Download the artifact from the workflow run
gh run download 26200018367 -n agent -D /tmp/agent-26200018367

# Apply the patch to the pull request branch
git fetch origin fix/nullness-dropping-alias
git checkout fix/nullness-dropping-alias
git am --3way /tmp/agent-26200018367/aw-fix-nullness-dropping-alias.patch
git push origin fix/nullness-dropping-alias

To route changes like this to a review issue instead of blocking, configure protected-files: fallback-to-issue in your workflow configuration.