fix: detect claude-terminal prompt with v2.1 placeholder hint (#766)

* fix: detect claude-terminal prompt with v2.1 placeholder hint

The tail-line regex required the prompt line to be exactly `❯` (or `❱` / `>`),
but Claude Code v2.1 renders the input row as `❯ Try "..."` so the regex never
matches and `waitForClaudeInputReady` times out after 60s.

Relax the pattern to `^[❯❱>](?:\s|$)` so any prompt char followed by whitespace
(or end-of-line) is accepted. The busy pattern still gates ready-detection, so
the placeholder hint cannot cause a false positive.

Refs #765

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* fix: exclude numbered menu items from claude-terminal prompt detection

The previous regex `^[❯❱>](?:\s|$)` accepted lines like `❯ 1. Yes, I trust
this folder` as a ready prompt, which would cause `pasteText` to silently
forward the user's prompt body into a trust/permission dialog instead of
the real input box. The old `^[❯❱>]$` failed-loud with a 60s timeout in
this scenario; the v2.1 fix re-introduced it as a silent regression.

Tighten the pattern with a negative lookahead so any `<prompt> <digit>.`
sequence (numbered menus) is rejected, and add a regression test that
proves the trust dialog stays not-ready until claude transitions to a
real input row.

Refs #765

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hiranorrr

src/__tests__/claude-terminal-tmux-backend.test.ts

@@ -198,6 +198,86 @@ describe('TmuxTerminalBackend', () => {
     ]);
   });
 
+  it('Given Claude trust dialog with numbered menu, When pasteText is called, Then trust dialog is not treated as ready and prompt is only pasted after transition to real input', async () => {
+    const backend = new TmuxTerminalBackend();
+    const stdinWrites: string[] = [];
+    const trustDialogPane = [
+      '────────────────────────────────────────',
+      '❯ 1. Yes, I trust this folder',
+      '  2. No, exit',
+    ].join('\n');
+    const realReadyPane = [
+      '────────────────────────────────────────',
+      '❯ Try "refactor routing.ts"',
+      '────────────────────────────────────────',
+    ].join('\n');
+    const capturedPanes = [
+      trustDialogPane,
+      trustDialogPane,
+      realReadyPane,
+      realReadyPane,
+      'pasted prompt',
+    ];
+    mockSpawn.mockImplementation(() => createSpawnChild(stdinWrites, 0, ''));
+    mockExecFile.mockImplementation((_file, args, _options, callback) => {
+      if (args[0] === 'capture-pane') {
+        callback(null, { stdout: capturedPanes.shift() ?? 'pasted prompt', stderr: '' });
+        return;
+      }
+      callback(null, { stdout: '', stderr: '' });
+    });
+
+    await backend.pasteText({ id: 'tmux-session', name: 'takt-session' }, 'implement task');
+
+    expect(stdinWrites).toEqual(['implement task']);
+    expect(mockExecFile.mock.calls.map((call) => call[1][0])).toEqual([
+      'capture-pane',
+      'capture-pane',
+      'capture-pane',
+      'capture-pane',
+      'paste-buffer',
+      'capture-pane',
+      'send-keys',
+      'delete-buffer',
+    ]);
+  });
+
+  it('Given Claude v2.1 pane with placeholder hint after prompt char, When pasteText is called, Then prompt is detected as ready', async () => {
+    const backend = new TmuxTerminalBackend();
+    const stdinWrites: string[] = [];
+    const v21ReadyPane = [
+      '────────────────────────────────────────',
+      '❯ Try "refactor routing.ts"',
+      '────────────────────────────────────────',
+      '  ⏵⏵ auto mode on · ◉ xhigh · /effort',
+    ].join('\n');
+    const capturedPanes = [
+      v21ReadyPane,
+      v21ReadyPane,
+      'implement task',
+    ];
+    mockSpawn.mockImplementation(() => createSpawnChild(stdinWrites, 0, ''));
+    mockExecFile.mockImplementation((_file, args, _options, callback) => {
+      if (args[0] === 'capture-pane') {
+        callback(null, { stdout: capturedPanes.shift() ?? 'implement task', stderr: '' });
+        return;
+      }
+      callback(null, { stdout: '', stderr: '' });
+    });
+
+    await backend.pasteText({ id: 'tmux-session', name: 'takt-session' }, 'implement task');
+
+    expect(stdinWrites).toEqual(['implement task']);
+    expect(mockExecFile.mock.calls.map((call) => call[1][0])).toEqual([
+      'capture-pane',
+      'capture-pane',
+      'paste-buffer',
+      'capture-pane',
+      'send-keys',
+      'delete-buffer',
+    ]);
+  });
+
   it('Given tmux paste-buffer fails after loading prompt, When pasteText rejects, Then tmux buffer is deleted', async () => {
     const backend = new TmuxTerminalBackend();
     const stdinWrites: string[] = [];

src/infra/claude-terminal/tmux-backend.ts

@@ -13,7 +13,7 @@ const PANE_CHANGE_TIMEOUT_MS = 5000;
 const PANE_POLL_INTERVAL_MS = 100;
 const CLAUDE_READY_TAIL_LINES = 3;
 const CLAUDE_BUSY_PATTERN = /(Running|thinking|Searching|Reading|Writing|Editing|Crunched)/i;
-const CLAUDE_PROMPT_PATTERN = /^[❯❱>]$/;
+const CLAUDE_PROMPT_PATTERN = /^[❯❱>](?:\s+(?!\d+\.\s)|$)/;
 
 function getProperty(error: object, property: string): unknown {
   return (error as Record<string, unknown>)[property];