- Deprecate mockPayloadModule with throw guard (hoisting incompatible)
- Replace `as never` with stubPayloadConfig in payload-articles test (consistency)
- Tighten pages contract to use toHaveLength (exact assertions)
- Header contract: define CONTRACT_HEADER_SEED, assert item count + order
Reviewer: superpowers:code-reviewer (Task 4 of Plan 7).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Each repository interface now has a contract suite under
src/__contracts__/. Both Mock and Payload implementations run the
same suite, eliminating mock-vs-real drift. Payload impls back the
contract with an in-memory stub via vi.mock('payload') + a small
buildPayloadStub helper.
Spec: §5.2, §6.4