fix(ci): budget native Windows coverage timing

scripts/run-gates.ts

@@ -481,6 +481,9 @@ function lintGate(options: { needs?: string[] } = {}): Gate {
 // small share. A budget of 1 gives each gate 1 worker; lanes that need a
 // strict total of one (the serial reference jobs) also set
 // DSH_GATE_CONCURRENCY=1, which keeps the gates from overlapping at all.
+// DSH_COVERAGE_TEST_TIMEOUT_MS raises Vitest's per-test and expect.poll
+// defaults together for instrumented lanes whose scheduling overhead exceeds
+// those defaults. Explicit fixture timeouts remain authoritative.
 function coverageWorkerArgs(): { instrumented: string[]; exempt: string[] } {
   const [flag] = positiveIntArg('DSH_COVERAGE_MAX_WORKERS', '--maxWorkers')
   if (flag === undefined) return { instrumented: [], exempt: [] }
@@ -493,14 +496,23 @@ function coverageWorkerArgs(): { instrumented: string[]; exempt: string[] } {
   }
 }
 
+function coverageTimeoutArgs(): string[] {
+  return [
+    ...positiveIntArg('DSH_COVERAGE_TEST_TIMEOUT_MS', '--testTimeout'),
+    ...positiveIntArg('DSH_COVERAGE_TEST_TIMEOUT_MS', '--expect.poll.timeout'),
+  ]
+}
+
 function coverageGates(): Gate[] {
   const workers = coverageWorkerArgs()
+  const timeouts = coverageTimeoutArgs()
   return [
     pnpmExec('coverage', [
       'vitest',
       'run',
       '--coverage',
       ...workers.instrumented,
+      ...timeouts,
     ], {
       label: 'test:coverage',
       env: { [COVERAGE_EXEMPT_ENV]: '1' },
@@ -510,6 +522,7 @@ function coverageGates(): Gate[] {
       'run',
       ...coverageExemptHeavySuites.map(suite => suite.filter),
       ...workers.exempt,
+      ...timeouts,
     ], {
       label: 'test:coverage-exempt-heavy',
     }),