Add smart ACK provider for WeChat MP replies

Replace fixed ackText with a rule-based AckProvider that picks
response templates by message type and intent (translate, summary,
rewrite, poster, ppt, mindmap, code, search, schedule). Pure sync,
zero I/O, auto-falls back to config.ackText on any error.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

user-memory-profile.test.mjs

@@ -5,6 +5,10 @@ import os from 'node:os';
 import path from 'node:path';
 import {
   buildInitialUserMemoryProfile,
+  buildTaskRoutingAgentText,
+  resolveCodeExecutorRouting,
+  renderCodeExecutorGuidance,
+  suggestCodeExecutorForTask,
   buildSessionMemoryEntries,
   ensureUserMemoryProfile,
   hasMemoryStore,
@@ -57,17 +61,29 @@ test('buildSessionMemoryEntries injects sandbox, guidance, and profile', () => {
     displayName: 'Bob',
     username: 'bob',
   });
-  const sessionPolicy = buildAgentExtensionPolicy(DEFAULT_USER_CAPABILITIES);
+  const sessionPolicy = {
+    ...buildAgentExtensionPolicy({
+      ...DEFAULT_USER_CAPABILITIES,
+      aider: true,
+      openhands: true,
+    }),
+    policies: {
+      code_delegate_executor: 'openhands',
+      code_task_routing: 'split',
+    },
+  };
   const entries = buildSessionMemoryEntries({
     workingDir: root,
     sessionPolicy,
     sandboxConstraints: '## sandbox',
     userContext: { userId: 'user-2', displayName: 'Bob', username: 'bob' },
   });
-  assert.equal(entries.length, 3);
+  assert.equal(entries.length, 4);
   assert.equal(entries[0].title, 'TKMind 用户空间沙箱');
-  assert.match(entries[1].content, /长期记忆/);
-  assert.match(entries[2].content, /Bob/);
+  assert.equal(entries[1].title, 'TKMind 代码委托策略');
+  assert.match(entries[1].content, /openhands/);
+  assert.match(entries[2].content, /长期记忆/);
+  assert.match(entries[3].content, /Bob/);
 });
 
 test('renderMemoryStoreGuidance scopes memory to one user', () => {
@@ -87,3 +103,58 @@ test('buildInitialUserMemoryProfile seeds defaults', () => {
   assert.equal(profile.responseStyle, 'balanced');
   assert.deepEqual(profile.preferences, []);
 });
+
+test('renderCodeExecutorGuidance reflects preferred executor and fallback', () => {
+  const text = renderCodeExecutorGuidance({
+    extensionOverrides: [
+      { name: 'aider' },
+      { name: 'openhands' },
+    ],
+    policies: {
+      code_delegate_executor: 'aider',
+      code_task_routing: 'force_aider',
+    },
+  });
+  assert.match(text, /aider/i);
+  assert.match(text, /openhands/i);
+  assert.match(text, /优先使用/);
+  assert.match(text, /统一走 `aider`/);
+});
+
+test('resolveCodeExecutorRouting falls back when preferred executor is unavailable', () => {
+  const routing = resolveCodeExecutorRouting({
+    extensionOverrides: [{ name: 'aider' }],
+    policies: {
+      code_delegate_executor: 'openhands',
+      code_task_routing: 'split',
+    },
+  });
+  assert.deepEqual(routing.available, ['aider']);
+  assert.equal(routing.preferred, 'auto');
+  assert.equal(routing.routing, 'split');
+  assert.match(routing.rules[0], /auto/);
+});
+
+test('suggestCodeExecutorForTask prefers openhands for repo refactor style tasks', () => {
+  const suggestion = suggestCodeExecutorForTask(
+    '请帮我重构这个仓库里的认证流程，涉及多文件并跑一下测试',
+    {
+      extensionOverrides: [{ name: 'aider' }, { name: 'openhands' }],
+      policies: { code_delegate_executor: 'auto', code_task_routing: 'split' },
+    },
+  );
+  assert.equal(suggestion?.suggestedExecutor, 'openhands');
+});
+
+test('buildTaskRoutingAgentText preserves task body and adds hidden routing hint', () => {
+  const text = buildTaskRoutingAgentText(
+    '请修复这个按钮点击无效的 bug，改一下前端代码',
+    {
+      extensionOverrides: [{ name: 'aider' }, { name: 'openhands' }],
+      policies: { code_delegate_executor: 'aider', code_task_routing: 'force_aider' },
+    },
+  );
+  assert.match(text, /TKMind 路由提示/);
+  assert.match(text, /aider/i);
+  assert.match(text, /请修复这个按钮点击无效的 bug，改一下前端代码/);
+});