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
• REUSE.toml already has a catch-all ["**"] glob covering all files; no changes needed there

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.

Workflows fixed:

• ci.yml (emits: Dependency & Standards Validation)
• security-analysis.yml (emits: Security Gate Validation)
• reuse.yml (emits: Check REUSE Compliance)
• pr-validation.yml (well-known required-check emitter)

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: defaults

Review profile: CHILL

Plan: Pro

Run ID: baab27a1-aef1-48e7-b4d2-66afabedc4c4

📥 Commits

Reviewing files that changed from the base of the PR and between c7e7593 and d035eb9.

📒 Files selected for processing (4)

• .github/workflows/ci.yml
• .github/workflows/pr-validation.yml
• .github/workflows/reuse.yml
• .github/workflows/security-analysis.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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[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

None

[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