Provide code review feedback for CCM-14200 event-driven callback delivery

[Copilot]

Conducted code review of event-driven callback delivery implementation at user request (@copilot review).

Review Findings

✅ Code Quality

• All 69 unit tests pass with good coverage (mock-webhook: 100%, transform-filter: 84.8%)
• TypeScript compilation clean
• No debugging artifacts or code smells
• Robust error handling with structured error types
• Comprehensive CloudEvents validation with NHS Notify extensions

⚠️ Issues Identified

1. Commit History Cleanup Required

   • 6 of 8 commits marked as WIP/DROP/fixup
   • Should be squashed into logical, production-ready commits before merge

2. Coverage Threshold Reduction

   • client-transform-filter-lambda/jest.config.ts lowered from 80/100/100 to 50/50/50
   • Actual branch coverage: 59.79% (below 80% target)
   • error-handler.ts has 37.5% branch coverage
   • Recommend: increase test coverage or document justification

3. Linting Configuration

   • Missing eslint-plugin-react-hooks dependency
   • Requires investigation to determine if pre-existing or introduced

Response

Provided detailed review comment with actionable recommendations for cleanup before merge.

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[Copilot]

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