Task 9.1: Update Main src/index.ts Exports

**Phase:** 9 - Documentation & Examples (Medium Priority)

**Tags:** documentation

**Description:**
Update `src/index.ts` to add exports for all new modules (observability, resilience, etc.).

**Acceptance Criteria:**
- [ ] Update `src/index.ts` to add exports for all new modules
- [ ] Include observability exports
- [ ] Include resilience exports
- [ ] Include other new module exports