feat: auto-name sessions from first prompt

test/session-submit-anchor.test.ts

@@ -12,6 +12,7 @@
 
 import { describe, it, expect } from 'vitest';
 import { Session } from '../src/session.js';
+import { deriveAutoSessionName, SubmittedPromptTracker } from '../src/session-auto-name.js';
 
 describe('session submit anchor', () => {
   it('records the pane Enter and carries it into persisted state', () => {
@@ -53,3 +54,31 @@ describe('session submit anchor', () => {
     expect(recovered.lastSubmitAt).toBe(0);
   });
 });
+
+describe('automatic session names', () => {
+  it('builds a bounded title from the first sentence without exposing controls', () => {
+    expect(deriveAutoSessionName('  修复登录跳转问题。\n不要改数据库')).toBe('修复登录跳转问题。');
+    expect(deriveAutoSessionName('/clear')).toBeNull();
+    expect(deriveAutoSessionName('\x1b[31m整理项目文档\x1b[0m')).toBe('整理项目文档');
+    expect(Array.from(deriveAutoSessionName('a'.repeat(200)) ?? '')).toHaveLength(72);
+  });
+
+  it('tracks chunked typing, backspace, and Enter without treating arrows as prompt text', () => {
+    const tracker = new SubmittedPromptTracker();
+    expect(tracker.feed('修复登')).toEqual([]);
+    expect(tracker.feed('录跳转\x7f问题\r')).toEqual(['修复登录跳问题']);
+    expect(tracker.feed('旧内容\x1b[A新内容\r')).toEqual(['新内容']);
+  });
+
+  it('keeps manual names protected while generated names remain eligible', () => {
+    const generated = new Session({ workingDir: '/tmp', name: 'w1-demo' });
+    expect(generated.nameSource).toBe('auto');
+    expect(generated.applyAutoName('修复登录')).toBe(true);
+    expect(generated.applyAutoName('继续重命名')).toBe(true);
+
+    const manual = new Session({ workingDir: '/tmp', name: '我的工作窗口' });
+    expect(manual.nameSource).toBe('manual');
+    expect(manual.applyAutoName('不应覆盖')).toBe(false);
+    expect(manual.name).toBe('我的工作窗口');
+  });
+});