Upstream Mike PR review

[github-actions]

Automated-Upstream-Mike-Sync: true
Upstream-Risk: medium

PR open-legal-products#291 is promising but cannot be evaluated reliably until ROSS has a frontend unit-test and coverage harness.

Mike PR open-legal-products#291

• Outcome: needs-test-harness
• Capability: ROSS-native contract tests for frontend API wrappers, reducer/model helpers, and a measured no-regression coverage ratchet
• Series: frontend-lib-coverage
• Dependencies: Mike PR [Testing 05] test: minimal vitest harness for backend and frontend open-legal-products/mike#228 (minimal Vitest harness), Mike PR [Testing 18] test(frontend): API-client/SSE tests + coverage ratchet open-legal-products/mike#255 (initial frontend API-client tests)
• Prerequisites: Approved ROSS-native frontend test/coverage harness, Focused mapping from upstream cases to current frontend/src/app/lib/mikeApi.ts, folderDeleteState.ts, and modelAvailability.ts, Baseline ROSS coverage measurements before setting ratchet floors
• Reason: The current ROSS library seams exist, but frontend/package.json has no test or coverage scripts/dependencies and ROSS has no Vitest configuration; upstream routes and provider assumptions also diverge, so the tests and thresholds require a focused ROSS-native evaluation.

Retryable state

No code adaptation was applied. The candidate remains retryable and will not be retried until its recorded review date or an explicit reconsideration.