[amina69]

Summary

• Expand RiskService tests to cover event, fallback, deduplication, and repository paths; focused branch coverage is 100%.
• Make webhook retry limits configurable, persist terminal unrecoverable failures, and emit a typed permanent-failure domain event.
• Safely serialize circular error details in the existing globally registered exception filter.

Validation

• npm test (1,834 tests passed across 169 files)
• npm run test:cov
• npm run typecheck

Closes #424
Closes #425
Closes #433
Closes #434

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[Cjay-Cyber-2]

The branch now conflicts with current main across transaction/webhook/risk changes. I am holding it rather than guessing at behavior-changing conflict resolution; please rebase the branch onto main, resolve the conflicts, and rerun the green CI checks.