feat: improve mindspace asset handling and local runtime paths

wechat-mp.test.mjs

@@ -1,6 +1,7 @@
 import assert from 'node:assert/strict';
 import crypto from 'node:crypto';
 import fs from 'node:fs';
+import path from 'node:path';
 import test from 'node:test';
 import {
   buildWechatTextReply,
@@ -1853,7 +1854,7 @@ test('wechat mp service persists image and routes image url into agent prompt',
     await result.task;
   } finally {
     crypto.randomUUID = originalRandomUuid;
-    fs.rmSync(`/Users/john/PycharmProjects/test/test-memind/MindSpace/${testUserId}`, {
+    fs.rmSync(path.join(process.cwd(), 'MindSpace', testUserId), {
       recursive: true,
       force: true,
     });