ci: add merge_group trigger to required-check workflows

[williaby]

Summary

• Add merge_group: to workflows emitting required status checks so they fire in the merge queue
• Patch REUSE.toml to cover files added by the compliance rollout that were missing from annotations

GitHub merge queues fire a merge_group event, not pull_request. Without the trigger,
required checks never report and the queue stalls indefinitely waiting for them.

Test plan

• Confirm all required checks pass on this PR
• Add to merge queue and confirm it processes without stalling

Generated with Claude Code

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: db84f3b9-d8cd-40b5-930a-962d817abb6c

📥 Commits

Reviewing files that changed from the base of the PR and between ab325a9 and 8e68953.

📒 Files selected for processing (2)

• .github/workflows/pr-validation.yml
• .github/workflows/reuse.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/merge-queue-triggers

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

📢 Thoughts on this report? Let us know!

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud