Summary

• add a new additive src/agents/recovery/ module with three recovery patterns
  • retry-with-backoff.ts: typed exponential retry with jitter and transient failure classification
  • model-fallback-cascade.ts: priority-aware model cascade with invalid-response handling
  • task-reassignment.ts: structured reassignment event payloads for orchestrators
• add index.ts barrel export for the new module
• add unit tests for each new recovery pattern

Validation

• pnpm vitest run src/agents/recovery/*.test.ts ✅
• pnpm test ❌ (fails on pre-existing unrelated workspace issues: missing optional extension deps and unrelated baseline test failures)