fix(ci): avoid Windows shell arg overflow in unit-fast

vitest.unit.config.ts

@@ -1,3 +1,4 @@
+import fs from "node:fs";
 import { defineConfig } from "vitest/config";
 import baseConfig from "./vitest.config.ts";
 import {
@@ -8,12 +9,33 @@ import {
 const base = baseConfig as unknown as Record<string, unknown>;
 const baseTest = (baseConfig as { test?: { include?: string[]; exclude?: string[] } }).test ?? {};
 const exclude = baseTest.exclude ?? [];
+export function loadExtraExcludePatternsFromEnv(
+  env: Record<string, string | undefined> = process.env,
+): string[] {
+  const extraExcludeFile = env.OPENCLAW_VITEST_EXTRA_EXCLUDE_FILE?.trim();
+  if (!extraExcludeFile) {
+    return [];
+  }
+  const parsed = JSON.parse(fs.readFileSync(extraExcludeFile, "utf8")) as unknown;
+  if (!Array.isArray(parsed)) {
+    throw new TypeError(
+      `OPENCLAW_VITEST_EXTRA_EXCLUDE_FILE must point to a JSON array: ${extraExcludeFile}`,
+    );
+  }
+  return parsed.filter((value): value is string => typeof value === "string" && value.length > 0);
+}
 
 export default defineConfig({
   ...base,
   test: {
     ...baseTest,
     include: unitTestIncludePatterns,
-    exclude: [...exclude, ...unitTestAdditionalExcludePatterns],
+    exclude: [
+      ...new Set([
+        ...exclude,
+        ...unitTestAdditionalExcludePatterns,
+        ...loadExtraExcludePatternsFromEnv(),
+      ]),
+    ],
   },
 });