- Implemented pure TypeScript CRM domain (entities, validation, opportunity stage + task transitions) in `packages/domain/src/index.ts:1`.
- Added focused domain tests in `packages/domain/test/domain.test.ts:1`.
- Implemented in-memory CRM API (referential integrity, CRUD-ish ops, dashboard summary, injectable clock) in `packages/api/src/index.ts:1`.
- Added focused API tests in `packages/api/test/api.test.ts:1`.
- Wrote docs/specs in `docs/prd.md:1`, `docs/acceptance-criteria.md:1`, `docs/architecture/domain-model.md:1`, `docs/api-contracts.md:1`, `specs/invariants.md:1`, `docs/test-strategy.md:1`, `docs/handover.md:1`, and updated `README.md:1`.
- Verified workspace passes: `npm run lint`, `npm run typecheck`, `npm run test`.