修正 sccache 测试的平台隔离

为启用 sccache 的用例补充 Windows platform mock

确保 POSIX 环境下测试不会误走 env wrapper 分支

scripts/dev.test.ts

@@ -658,16 +658,31 @@ describe('dev scheduler local worker cleanup', () => {
 
 describe('dev scheduler Rust build env', () => {
   test('local dev Rust env enables available sccache wrapper', () => {
-    const env = buildLocalRustProcessEnv(
-      {
-        RUSTC_WRAPPER: '/usr/bin/sccache',
-        CARGO_BUILD_RUSTC_WRAPPER: 'sccache',
-      },
-      { log: false, sccacheAvailable: true },
+    const originalPlatform = Object.getOwnPropertyDescriptor(
+      process,
+      'platform',
     );
+    Object.defineProperty(process, 'platform', {
+      configurable: true,
+      value: 'win32',
+    });
 
-    expect(env.RUSTC_WRAPPER).toBe('sccache');
-    expect(env.CARGO_BUILD_RUSTC_WRAPPER).toBe(env.RUSTC_WRAPPER);
+    try {
+      const env = buildLocalRustProcessEnv(
+        {
+          RUSTC_WRAPPER: '/usr/bin/sccache',
+          CARGO_BUILD_RUSTC_WRAPPER: 'sccache',
+        },
+        { log: false, sccacheAvailable: true },
+      );
+
+      expect(env.RUSTC_WRAPPER).toBe('sccache');
+      expect(env.CARGO_BUILD_RUSTC_WRAPPER).toBe(env.RUSTC_WRAPPER);
+    } finally {
+      if (originalPlatform) {
+        Object.defineProperty(process, 'platform', originalPlatform);
+      }
+    }
   });
 
   test('local dev Rust env keeps healthy custom wrapper untouched', () => {