fix(ci): prevent vitest worker timeout during coverage

Use --no-file-parallelism for coverage runs in CI to prevent
"Timeout calling onTaskUpdate" errors caused by v8 coverage
instrumentation overwhelming worker IPC on single-core runners.
Also add teardownTimeout to vitest config.

Author: bntvllnt

.github/workflows/ci.yml

@@ -44,7 +44,7 @@ jobs:
 
       - name: Test with coverage
         if: matrix.node-version == 22
-        run: pnpm vitest run --coverage
+        run: pnpm vitest run --coverage --no-file-parallelism
 
       - name: Upload coverage
         if: matrix.node-version == 22

vitest.config.ts

@@ -12,6 +12,7 @@ export default defineConfig({
     include: ["src/**/*.test.ts", "tests/**/*.test.ts"],
     testTimeout: 15000,
     hookTimeout: 15000,
+    teardownTimeout: 30000,
     coverage: {
       provider: "v8",
       include: ["src/**/*.ts"],