The previous commit referenced nonexistent files
(navigation-repository.contract.ts, tests/get-header.feature.test.ts).
The actual contract is header-repository.contract.ts and navigation has
no tests/ directory yet. Also adds nav-item.factory.ts to the factories
bullet (created in Task 3).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Captures the decision to add @repo/core-testing, factories, contract
suites, vitest safety defaults, coverage thresholds, Storybook
test-runner, and CI as one cohesive TDD foundation. Per-feature
AGENTS.md gains a Tests section pointing to factories, contract suite,
and the canonical test commands.
Spec: §7.4, §7.5
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
