Task 4.1: Document Worker Serialization Issue

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

**Tags:** documentation, workers

**Description:**
Add TODO comments in `src/workers/workerActor.ts` regarding serialization.

**Acceptance Criteria:**
- [ ] Add TODO comments in `src/workers/workerActor.ts` regarding serialization
- [ ] Document the current limitations
- [ ] Suggest future improvements