feat: add semantic WeChat session actions

wechat/wechat-channel.test.mjs

@@ -4,6 +4,7 @@ import os from 'node:os';
 import path from 'node:path';
 import test from 'node:test';
 import { classifyWechatIntent, isPageGenerateIntent } from './intent/classifier.mjs';
+import { resolveWechatSessionAction } from './intent/session-action.mjs';
 import {
   filterSendableHtmlArtifacts,
   isStubPublicHtmlContent,
@@ -37,6 +38,26 @@ test('classifyWechatIntent detects session.reset', () => {
   assert.equal(classifyWechatIntent({ msgType: 'text', agentText: '换新会话' }).kind, 'session.reset');
 });
 
+test('resolveWechatSessionAction recognizes natural new-session expressions', async () => {
+  for (const text of ['换新会话', '新开一个会话', '我们重新开始吧', '从头来']) {
+    const result = await resolveWechatSessionAction(text);
+    assert.equal(result.action, 'reset', text);
+  }
+});
+
+test('resolveWechatSessionAction separates ignore-context from reset', async () => {
+  assert.equal((await resolveWechatSessionAction('不要参考刚才关于医联体的内容')).action, 'ignore_previous');
+  assert.equal((await resolveWechatSessionAction('继续刚才的话题')).action, 'continue');
+});
+
+test('resolveWechatSessionAction uses an injected semantic classifier for unclear text', async () => {
+  const result = await resolveWechatSessionAction('我们换个思路聊', {
+    semanticClassifier: async () => ({ action: 'reset', confidence: 0.88, reason: '新对话意图' }),
+  });
+  assert.equal(result.action, 'reset');
+  assert.equal(result.source, 'semantic_model');
+});
+
 test('selectSendableHtmlArtifacts never returns stub html', () => {
   const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'wechat-stub-'));
   const stubPath = path.join(dir, 'tang-poem.html');
@@ -85,6 +106,15 @@ test('buildWechatAgentPrompt lives in wechat prompts package', () => {
   assert.match(prompt, /schedule-assistant/);
 });
 
+test('buildWechatAgentPrompt carries ignore-previous context boundary', () => {
+  const prompt = buildWechatAgentPrompt({
+    msgType: 'text',
+    agentText: '请分析这段新内容',
+    sessionAction: 'ignore_previous',
+  });
+  assert.match(prompt, /忽略此前相关内容/);
+});
+
 test('schedule confirmation guard blocks false positives', async () => {
   assert.equal(looksLikeScheduleConfirmation('已经帮你设置好了待办提醒'), true);
   const guarded = await guardScheduleConfirmationReply({