fix: preserve session titles without context enhancement

test/session-title.test.mjs

@@ -0,0 +1,57 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+
+import {
+  INITIAL_SESSION_TITLE_MAX_BYTES,
+  initialSessionTitle,
+} from '../src/channels/shared/session-title.mjs';
+
+test('initial Session titles use original text instead of enhanced context', () => {
+  const content = [
+    {
+      type: 'text',
+      text: '<dsh_im_source>{"channel":"qq"}</dsh_im_source>\n\n'
+        + '<dsh_im_source_guidance>reply formally</dsh_im_source_guidance>',
+    },
+    { type: 'text', text: 'enhanced copy' },
+  ];
+
+  assert.equal(initialSessionTitle({
+    text: '  帮我查询\n今天的订单  ',
+    content,
+  }), '帮我查询 今天的订单');
+});
+
+test('initial Session titles strip only leading dsh-im context from structured prompts', () => {
+  const content = [
+    {
+      type: 'text',
+      text: '<dsh_im_source>{"channel":"feishu"}</dsh_im_source>\n\n'
+        + '<dsh_im_source_guidance>private guidance</dsh_im_source_guidance>',
+    },
+    { type: 'text', text: '请分析这张图片。' },
+    { type: 'image', mediaType: 'image/png', data: 'AAAA' },
+  ];
+
+  const title = initialSessionTitle({ content });
+  assert.equal(title, '请分析这张图片。');
+  assert.doesNotMatch(title, /dsh_im_source|private guidance/u);
+
+  assert.equal(initialSessionTitle({
+    text: '<dsh_im_source>这是用户正文</dsh_im_source>',
+  }), '<dsh_im_source>这是用户正文</dsh_im_source>');
+});
+
+test('initial Session titles truncate safely within the UTF-8 byte budget', () => {
+  const title = initialSessionTitle({ text: '订单'.repeat(30) });
+  assert.equal(title.endsWith('…'), true);
+  assert.equal(Buffer.byteLength(title, 'utf8') <= INITIAL_SESSION_TITLE_MAX_BYTES, true);
+});
+
+test('initial Session titles fall back to a safe inbound filename', () => {
+  assert.equal(initialSessionTitle({
+    text: '',
+    files: [{ name: '../reports/报价单.xlsx' }],
+  }), '报价单.xlsx');
+  assert.equal(initialSessionTitle({ text: '', content: [], files: [] }), null);
+});