- internal/platform: cross-platform path detection, 6 tests - internal/auth: JWT generation/validation + bcrypt, 8 tests - 89 total tests, build + vet clean
- internal/nats: Connection interface + InProcessConn, 7 tests - internal/db: PostgreSQL connection pool + migration runner, 5 tests - 75 total tests, build + vet clean
- config: env-based loading with startup validation, 13 tests - logger: structured slog wrapper with redaction, 10 tests - errors: unified AppError model with HTTP mapping, 18 tests - 41 tests total, build + vet clean