refactor: Enhance PR triage test documentation and alignment with production

[ashleyshaw]

Linked issues

Closes#2160

Summary

Enhance PR triage test suites documentation and clarify the refactoring approach for testing automation script workflows. Tests now clearly document why pure function implementations are embedded to avoid ES module complexity while ensuring comprehensive coverage of production workflows.

Changes

• Enhanced documentation in pr-triage-orchestrator.test.js explaining embedded implementations
• Added clarifying comments in sync-pr-labels.test.js on test function purpose and production alignment
• Improved integration test documentation in integration-workflow-pr-triage.test.js with workflow explanation
• Existing 104 tests maintained with full coverage across all three test suites

Verification

• All 104 tests passing (pr-triage-orchestrator: 39, sync-pr-labels: 47, integration: 18)
• Code quality checks pass
• Tests cover edge cases, error handling, and complete workflows

Risk & Rollback

• Risk level: Very Low (documentation only)
• Rollback plan: revert commit

Changelog

• Enhanced test documentation to clarify implementation approach and production alignment for PR triage test suites
• Clarified why pure functions are embedded in tests vs imported from production modules (Jest ES module compatibility)

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Checklist (Global DoD / PR)

• All AC met and demonstrated
• Tests added/updated (documentation only)
• Accessibility checklist completed (where relevant):
  • N/A - Documentation only
• Docs/readme/changelog updated (if user-facing)
• Security checklist completed (where relevant):
  • N/A - Documentation only
• Code/design reviews approved
• CI green; linked issues closed; release notes prepared (if shipping)

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Review details

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Run ID: 21c0360d-7a97-4fdd-8e16-c1effd8a1d4a

📥 Commits

Reviewing files that changed from the base of the PR and between 7046740 and 887cf90.

📒 Files selected for processing (3)

• scripts/automation/__tests__/integration-workflow-pr-triage.test.js
• scripts/automation/__tests__/pr-triage-orchestrator.test.js
• scripts/automation/__tests__/sync-pr-labels.test.js

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[github-actions]

⏱️ Aging and SLA annotation

• Age: 0 day(s)
• SLA state: Within SLA
• Thresholds: warn at 7 days, breach at 14 days
• Last updated: 2026-08-20T11:21:58.278Z

Maintained by project-meta-sync workflow.

[github-actions]

✅ Template check passed after update. Thanks for fixing the PR description.

[github-actions]

🔍 Reviewer Summary for PR #2172

CI Status: ✅ success
Files changed: 3
Risk Distribution: 0 critical, 0 high, 3 medium, 0 low

Recommendations

• Ready to proceed pending human review

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