takt 対話モードの save_task を takt add と同じ worktree 設定フローに統一

takt 対話モードで Save Task を選択した際に worktree/branch/auto_pr の
設定プロンプトがスキップされ、takt run で clone なしに実行されて成果物が
消失するバグを修正。promptWorktreeSettings() を共通関数として抽出し、
saveTaskFromInteractive() と addTask() の両方から使用するようにした。

src/__tests__/saveTaskFile.test.ts

@@ -17,6 +17,11 @@ vi.mock('../shared/ui/index.js', () => ({
   blankLine: vi.fn(),
 }));
 
+vi.mock('../shared/prompt/index.js', () => ({
+  confirm: vi.fn(),
+  promptInput: vi.fn(),
+}));
+
 vi.mock('../shared/utils/index.js', async (importOriginal) => ({
   ...(await importOriginal<Record<string, unknown>>()),
   createLogger: () => ({
@@ -28,11 +33,14 @@ vi.mock('../shared/utils/index.js', async (importOriginal) => ({
 
 import { summarizeTaskName } from '../infra/task/summarize.js';
 import { success, info } from '../shared/ui/index.js';
+import { confirm, promptInput } from '../shared/prompt/index.js';
 import { saveTaskFile, saveTaskFromInteractive } from '../features/tasks/add/index.js';
 
 const mockSummarizeTaskName = vi.mocked(summarizeTaskName);
 const mockSuccess = vi.mocked(success);
 const mockInfo = vi.mocked(info);
+const mockConfirm = vi.mocked(confirm);
+const mockPromptInput = vi.mocked(promptInput);
 
 let testDir: string;
 
@@ -163,16 +171,82 @@ describe('saveTaskFile', () => {
 });
 
 describe('saveTaskFromInteractive', () => {
-  it('should save task and display success message', async () => {
+  it('should save task with worktree settings when user confirms worktree', async () => {
+    // Given: user confirms worktree, accepts defaults, confirms auto-PR
+    mockConfirm.mockResolvedValueOnce(true);   // Create worktree? → Yes
+    mockPromptInput.mockResolvedValueOnce('');  // Worktree path → auto
+    mockPromptInput.mockResolvedValueOnce('');  // Branch name → auto
+    mockConfirm.mockResolvedValueOnce(true);   // Auto-create PR? → Yes
+
     // When
     await saveTaskFromInteractive(testDir, 'Task content');
 
     // Then
     expect(mockSuccess).toHaveBeenCalledWith('Task created: test-task.yaml');
     expect(mockInfo).toHaveBeenCalledWith(expect.stringContaining('Path:'));
+    const tasksDir = path.join(testDir, '.takt', 'tasks');
+    const files = fs.readdirSync(tasksDir);
+    const content = fs.readFileSync(path.join(tasksDir, files[0]!), 'utf-8');
+    expect(content).toContain('worktree: true');
+    expect(content).toContain('auto_pr: true');
+  });
+
+  it('should save task without worktree settings when user declines worktree', async () => {
+    // Given: user declines worktree
+    mockConfirm.mockResolvedValueOnce(false);  // Create worktree? → No
+
+    // When
+    await saveTaskFromInteractive(testDir, 'Task content');
+
+    // Then
+    expect(mockSuccess).toHaveBeenCalledWith('Task created: test-task.yaml');
+    const tasksDir = path.join(testDir, '.takt', 'tasks');
+    const files = fs.readdirSync(tasksDir);
+    const content = fs.readFileSync(path.join(tasksDir, files[0]!), 'utf-8');
+    expect(content).not.toContain('worktree:');
+    expect(content).not.toContain('branch:');
+    expect(content).not.toContain('auto_pr:');
+  });
+
+  it('should save custom worktree path and branch when specified', async () => {
+    // Given: user specifies custom path and branch
+    mockConfirm.mockResolvedValueOnce(true);              // Create worktree? → Yes
+    mockPromptInput.mockResolvedValueOnce('/custom/path'); // Worktree path
+    mockPromptInput.mockResolvedValueOnce('feat/branch');  // Branch name
+    mockConfirm.mockResolvedValueOnce(false);              // Auto-create PR? → No
+
+    // When
+    await saveTaskFromInteractive(testDir, 'Task content');
+
+    // Then
+    const tasksDir = path.join(testDir, '.takt', 'tasks');
+    const files = fs.readdirSync(tasksDir);
+    const content = fs.readFileSync(path.join(tasksDir, files[0]!), 'utf-8');
+    expect(content).toContain('worktree: /custom/path');
+    expect(content).toContain('branch: feat/branch');
+    expect(content).toContain('auto_pr: false');
+  });
+
+  it('should display worktree/branch/auto-PR info when settings are provided', async () => {
+    // Given
+    mockConfirm.mockResolvedValueOnce(true);              // Create worktree? → Yes
+    mockPromptInput.mockResolvedValueOnce('/my/path');     // Worktree path
+    mockPromptInput.mockResolvedValueOnce('my-branch');    // Branch name
+    mockConfirm.mockResolvedValueOnce(true);               // Auto-create PR? → Yes
+
+    // When
+    await saveTaskFromInteractive(testDir, 'Task content');
+
+    // Then
+    expect(mockInfo).toHaveBeenCalledWith('  Worktree: /my/path');
+    expect(mockInfo).toHaveBeenCalledWith('  Branch: my-branch');
+    expect(mockInfo).toHaveBeenCalledWith('  Auto-PR: yes');
   });
 
   it('should display piece info when specified', async () => {
+    // Given
+    mockConfirm.mockResolvedValueOnce(false);  // Create worktree? → No
+
     // When
     await saveTaskFromInteractive(testDir, 'Task content', 'review');
 
@@ -181,6 +255,9 @@ describe('saveTaskFromInteractive', () => {
   });
 
   it('should include piece in saved YAML', async () => {
+    // Given
+    mockConfirm.mockResolvedValueOnce(false);  // Create worktree? → No
+
     // When
     await saveTaskFromInteractive(testDir, 'Task content', 'custom');
 
@@ -193,6 +270,9 @@ describe('saveTaskFromInteractive', () => {
   });
 
   it('should not display piece info when not specified', async () => {
+    // Given
+    mockConfirm.mockResolvedValueOnce(false);  // Create worktree? → No
+
     // When
     await saveTaskFromInteractive(testDir, 'Task content');
 
@@ -202,4 +282,18 @@ describe('saveTaskFromInteractive', () => {
     );
     expect(pieceInfoCalls.length).toBe(0);
   });
+
+  it('should display auto worktree info when no custom path', async () => {
+    // Given
+    mockConfirm.mockResolvedValueOnce(true);   // Create worktree? → Yes
+    mockPromptInput.mockResolvedValueOnce('');  // Worktree path → auto
+    mockPromptInput.mockResolvedValueOnce('');  // Branch name → auto
+    mockConfirm.mockResolvedValueOnce(true);   // Auto-create PR? → Yes
+
+    // When
+    await saveTaskFromInteractive(testDir, 'Task content');
+
+    // Then
+    expect(mockInfo).toHaveBeenCalledWith('  Worktree: auto');
+  });
 });

src/features/tasks/add/index.ts

@@ -87,19 +87,52 @@ export function createIssueFromTask(task: string): void {
   }
 }
 
+interface WorktreeSettings {
+  worktree?: boolean | string;
+  branch?: string;
+  autoPr?: boolean;
+}
+
+async function promptWorktreeSettings(): Promise<WorktreeSettings> {
+  const useWorktree = await confirm('Create worktree?', true);
+  if (!useWorktree) {
+    return {};
+  }
+
+  const customPath = await promptInput('Worktree path (Enter for auto)');
+  const worktree: boolean | string = customPath || true;
+
+  const customBranch = await promptInput('Branch name (Enter for auto)');
+  const branch = customBranch || undefined;
+
+  const autoPr = await confirm('Auto-create PR?', true);
+
+  return { worktree, branch, autoPr };
+}
+
 /**
  * Save a task from interactive mode result.
- * Does not prompt for worktree/branch settings.
+ * Prompts for worktree/branch/auto_pr settings before saving.
  */
 export async function saveTaskFromInteractive(
   cwd: string,
   task: string,
   piece?: string,
 ): Promise<void> {
-  const filePath = await saveTaskFile(cwd, task, { piece });
+  const settings = await promptWorktreeSettings();
+  const filePath = await saveTaskFile(cwd, task, { piece, ...settings });
   const filename = path.basename(filePath);
   success(`Task created: ${filename}`);
   info(`  Path: ${filePath}`);
+  if (settings.worktree) {
+    info(`  Worktree: ${typeof settings.worktree === 'string' ? settings.worktree : 'auto'}`);
+  }
+  if (settings.branch) {
+    info(`  Branch: ${settings.branch}`);
+  }
+  if (settings.autoPr) {
+    info(`  Auto-PR: yes`);
+  }
   if (piece) info(`  Piece: ${piece}`);
 }
 
@@ -173,43 +206,25 @@ export async function addTask(cwd: string, task?: string): Promise<void> {
   }
 
   // 3. ワークツリー/ブランチ/PR設定
-  let worktree: boolean | string | undefined;
+  const settings = await promptWorktreeSettings();
-  let branch: string | undefined;
-  let autoPr: boolean | undefined;
-
-  const useWorktree = await confirm('Create worktree?', true);
-  if (useWorktree) {
-    const customPath = await promptInput('Worktree path (Enter for auto)');
-    worktree = customPath || true;
-
-    const customBranch = await promptInput('Branch name (Enter for auto)');
-    if (customBranch) {
-      branch = customBranch;
-    }
-
-    // PR確認（worktreeが有効な場合のみ）
-    autoPr = await confirm('Auto-create PR?', true);
-  }
 
   // YAMLファイル作成
   const filePath = await saveTaskFile(cwd, taskContent, {
     piece,
     issue: issueNumber,
-    worktree,
+    ...settings,
-    branch,
-    autoPr,
   });
 
   const filename = path.basename(filePath);
   success(`Task created: ${filename}`);
   info(`  Path: ${filePath}`);
-  if (worktree) {
+  if (settings.worktree) {
-    info(`  Worktree: ${typeof worktree === 'string' ? worktree : 'auto'}`);
+    info(`  Worktree: ${typeof settings.worktree === 'string' ? settings.worktree : 'auto'}`);
   }
-  if (branch) {
+  if (settings.branch) {
-    info(`  Branch: ${branch}`);
+    info(`  Branch: ${settings.branch}`);
   }
-  if (autoPr) {
+  if (settings.autoPr) {
     info(`  Auto-PR: yes`);
   }
   if (piece) {