apps/api runs ts-jest with isolatedModules: true, which skips cross-file
type checking. Task 3 proved the gap concretely: the suite reported
233/234 green while npm run build reported 21 real errors across 6
files. Every full-suite step now runs test && build, with a Global
Constraints note explaining why the build half is not redundant.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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