feat(api): add PR labels based on triage tier

[ljahier]

---

Note

Adds automatic GitHub label creation and application based on triage tier. Introduces ensure_label (idempotent get-or-create) on GitHubClient, three tier-mapped labels with colors/descriptions on Tier, a CommitInfo struct carrying SHA alongside message (needed to anchor reviews to a specific commit), and migrates all manual HTTP calls to typed octocrab API methods. Tests are migrated to mockall-generated mocks.

^{Written by Mendral for commit 30079f6.}

[pratrol]

Pratrol Triage Brief: 🟢 High Confidence

Pratrol assessed this pull request across the primary risk vectors below.

Risk Vector	Score	Tier
Contributor Context	70/100	🟢 High
Logic Risk (Mistral)	86/100	🟢 High
Overall Confidence	79/100	🟢 High

Summary: Added functionality to label PRs based on triage tier.

Key Signal: The change is well-structured and follows the existing codebase patterns.

Recommendation: Review the new add_labels method and ensure it handles errors gracefully.

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[mendral-app]

🤖 Code Review

Assessment ✅

Both previous comments are resolved. The TOCTOU race in ensure_label is correctly fixed: a 422 on create_label is now treated as success, making the operation idempotent under concurrent triage runs. The incremental diff introduces no new issues. LGTM.

Note

Tag @mendral-app with feedback or questions. View session