test(desktop): enforce full configured coverage

CHANGELOG.md

@@ -10,6 +10,7 @@
 
 ### Changed
 
+- Raised the configured desktop Vitest coverage thresholds to 100% for lines, functions, branches, and statements.
 - Pinned npm `10.9.9` as the approved lockfile generator, activated it through Node-bundled Corepack before dependency consumption, and fail closed unless its bundled `tar` is at least `7.5.19`; primary CI still consumes the committed lock only through frozen `npm ci` validation, rejects mutable npm resolution in the lock gate, requires integrity evidence for public-registry lock entries, and preserves generator-sensitive root `@esbuild/*` peer metadata.
 
 ### Fixed
@@ -74,4 +75,4 @@
 
 - `ChordsFeature` (코드 분석) 화면에서 각 파트(Role)의 `transpositionPlan`(이조/조옮김 계획)을 표시하는 기능을 추가했습니다.
 - `RangesFeature` (음역대 분석) 화면에서 겹침 경고(Overlap warning) 외에 해당 파트의 채보(Transcription) 가능 노드 수를 요약하여 보여주는 기능을 추가했습니다.
-- 신규 UI 요소에 대한 단위 테스트를 추가했습니다 (`apps/desktop/src/features/chords/index.test.tsx`, `apps/desktop/src/features/ranges/index.test.tsx`).
+- 신규 UI 요소에 대한 단위 테스트를 추가했습니다 (`apps/desktop/src/features/chords/index.test.tsx`, `apps/desktop/src/features/ranges/index.test.tsx`).

apps/desktop/vite.config.ts

@@ -28,10 +28,10 @@ export default defineConfig({
         "src/features/score/scoreStorage.ts"
       ],
       thresholds: {
-        lines: 90,
-        functions: 90,
-        branches: 90,
-        statements: 90
+        lines: 100,
+        functions: 100,
+        branches: 100,
+        statements: 100
       }
     }
   }

docs/engineering/acceptance-criteria.md

@@ -25,6 +25,9 @@ Run the narrowest passing set that covers touched areas, and do not claim succes
 - `npm run test`
 - `npm audit --workspaces --audit-level=high`
 
+The desktop Vitest coverage gate requires 100% lines, functions, branches, and
+statements for its configured source set.
+
 When CI/workflow files, supply-chain controls, or release/security docs are changed, also run:
 
 - `python3 scripts/checks/verify_supply_chain.py`