Task 4.4: Add Worker Serialization Tests

**Phase:** 4 - Risk Mitigation (High Priority)

**Tags:** test, workers

**Description:**
Add tests in `tests/workers/workerActor.test.ts` to verify complex data types work.

**Acceptance Criteria:**
- [ ] Add tests in `tests/workers/workerActor.test.ts`
- [ ] Verify complex data types work
- [ ] Test edge cases