Revert "fix(ci): raise Windows vitest timeout for subprocess skill tests"

This reverts commit d2cbb025bf.

vitest.config.ts

@@ -11,10 +11,6 @@ import { defineConfig } from 'vitest/config';
 // files are excluded here to avoid double-counting.
 export default defineConfig({
   test: {
-    // Windows CI runners are slower for subprocess + tree-sitter WASM cold starts;
-    // several skill tests (Swift import map, large scan-project fixtures) sit near
-    // the 5s default and flake under load.
-    testTimeout: process.platform === 'win32' ? 20_000 : 5_000,
     include: [
       'tests/**/*.test.{js,mjs,ts}',
       'understand-anything-plugin/src/**/*.test.{js,mjs,ts}',