ci: add PR title conventional commit validation

[panos-xyz]

Summary

• Add pr-title.yml workflow using amannn/action-semantic-pull-request to enforce conventional commit format on PR titles
• Invalid titles get a sticky comment with usage guidance; comment auto-removes when title is fixed
• Allowed types: feat, fix, chore, test, bench, perf, refactor, docs, ci, revert, deps, style

Test plan

• PR with valid title (e.g., feat: xxx) passes the check
• PR with invalid title (e.g., add something) fails and gets comment
• Editing title to valid format removes comment and passes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: ef746831-b082-4f40-a151-a364c06dd8c6

📥 Commits

Reviewing files that changed from the base of the PR and between f55a2cd and 6e32258.

📒 Files selected for processing (1)

• .github/workflows/pr-title.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch panos/pr-title

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