fix(flow): 修复 finish 阶段分支合并的多个问题

1. 在 BranchManager 添加 _cleanup_lock_file 方法，清理 lock 文件
2. 将分支合并移到 git 提交之后执行
3. 在分支合并前再次提交状态文件（解决 save_status 更新 hash 后未提交的问题）

测试任务：创建 test-cache/hello.py

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.aide/branches.json

@@ -1,5 +1,5 @@
 {
-  "next_number": 2,
+  "next_number": 3,
   "branches": [
     {
       "number": 1,
@@ -10,6 +10,16 @@
       "task_summary": "开始任务准备: 创建环境安装 Command",
       "started_at": "2025-12-17T04:54:31+08:00",
       "status": "active"
+    },
+    {
+      "number": 2,
+      "branch_name": "aide/002",
+      "source_branch": "master",
+      "start_commit": "be2573843758e916d4da0b4c11ed04eaa4143dde",
+      "task_id": "2025-12-17T05-33-04",
+      "task_summary": "测试任务：写一个 hello 程序",
+      "started_at": "2025-12-17T05:33:04+08:00",
+      "status": "active"
     }
   ]
 }

.aide/branches.md

@@ -1,5 +1,14 @@
 # Git 分支概况
 
+## aide/002
+
+- **任务**: 测试任务：写一个 hello 程序
+- **任务ID**: 2025-12-17T05-33-04
+- **源分支**: master
+- **起始提交**: be25738
+- **状态**: active
+- **时间**: 2025-12-17 05:33
+
 ## aide/001
 
 - **任务**: 开始任务准备: 创建环境安装 Command

.aide/flow-status.json

@@ -0,0 +1,75 @@
+{
+  "task_id": "2025-12-17T05-33-04",
+  "current_phase": "finish",
+  "current_step": 8,
+  "started_at": "2025-12-17T05:33:04+08:00",
+  "history": [
+    {
+      "timestamp": "2025-12-17T05:33:04+08:00",
+      "action": "start",
+      "phase": "task-optimize",
+      "step": 1,
+      "summary": "测试任务：写一个 hello 程序",
+      "git_commit": "356002d3d0377c11d3de2e3f16afd377c094d28a"
+    },
+    {
+      "timestamp": "2025-12-17T05:33:33+08:00",
+      "action": "next-part",
+      "phase": "flow-design",
+      "step": 2,
+      "summary": "简单任务，跳过任务优化",
+      "git_commit": "eb089ce02d848208f271cfa1d2c7cfe831c7c06f"
+    },
+    {
+      "timestamp": "2025-12-17T05:33:58+08:00",
+      "action": "next-part",
+      "phase": "impl",
+      "step": 3,
+      "summary": "简单任务，跳过流程设计",
+      "git_commit": "06f51ed01f04ea6cbc55b7c839a7d44582961603"
+    },
+    {
+      "timestamp": "2025-12-17T05:34:46+08:00",
+      "action": "next-step",
+      "phase": "impl",
+      "step": 4,
+      "summary": "创建 hello.py 程序",
+      "git_commit": "01ff16417784cb976d19ac81a43bc542bce6e61b"
+    },
+    {
+      "timestamp": "2025-12-17T05:35:00+08:00",
+      "action": "next-part",
+      "phase": "verify",
+      "step": 5,
+      "summary": "代码实现完成",
+      "git_commit": "e97781d75c2421ca6e8280bf57240b48e5599e0c"
+    },
+    {
+      "timestamp": "2025-12-17T05:35:37+08:00",
+      "action": "next-step",
+      "phase": "verify",
+      "step": 6,
+      "summary": "验证程序运行正常",
+      "git_commit": "bac4ce699628f581bc9ae5a3fa10ff32ccf38820"
+    },
+    {
+      "timestamp": "2025-12-17T05:35:51+08:00",
+      "action": "next-part",
+      "phase": "docs",
+      "step": 7,
+      "summary": "验证完成",
+      "git_commit": "4ac3aa186f33caf69bfe788537d5c473ffa019bf"
+    },
+    {
+      "timestamp": "2025-12-17T05:38:37+08:00",
+      "action": "next-part",
+      "phase": "finish",
+      "step": 8,
+      "summary": "测试任务完成，修复验证",
+      "git_commit": "7f59a660b1eafa4153ade83ceffe8075131ca32d"
+    }
+  ],
+  "source_branch": "master",
+  "start_commit": "be2573843758e916d4da0b4c11ed04eaa4143dde",
+  "task_branch": "aide/002"
+}

.aide/flow-status.lock

@@ -1 +0,0 @@
-34429

CHANGELOG.md

@@ -4,6 +4,14 @@
 
 ## 2025-12-17
 
+### 修复
+
+**aide flow 分支切换问题修复**
+- 修复 finish 阶段分支切换时 lock 文件冲突的问题
+- 修复 finish 阶段状态文件未提交导致切换失败的问题
+- 在 `BranchManager` 添加 `_cleanup_lock_file` 方法
+- 调整 `FlowTracker` 中分支合并的执行顺序（先提交再合并）
+
 ### 新增功能
 
 **环境安装 Commands**

aide-program/aide/flow/tracker.py

@@ -108,14 +108,6 @@ class FlowTracker:
                 if action == "next-part":
                     assert to_phase is not None
                     validator.validate_next_part(current_phase, to_phase)
-
-                    # 如果进入 finish 环节，执行分支合并
-                    if to_phase == "finish":
-                        success, merge_msg = self.branch_mgr.finish_branch_merge(
-                            task_summary=normalized_text,
-                        )
-                        if not success:
-                            output.warn(merge_msg)
                 elif action == "back-part":
                     assert to_phase is not None
                     validator.validate_back_part(current_phase, to_phase)
@@ -135,6 +127,18 @@ class FlowTracker:
                 final_status = self._do_git_commit(updated, commit_msg)
                 self.storage.save_status(final_status)
 
+                # 如果进入 finish 环节，执行分支合并（必须在提交后执行）
+                if action == "next-part" and to_phase == "finish":
+                    # 再次提交状态文件（因为 save_status 更新了 git_commit hash）
+                    self.git.add_all()
+                    self.git.commit("[aide] finish: 更新状态文件")
+
+                    success, merge_msg = self.branch_mgr.finish_branch_merge(
+                        task_summary=normalized_text,
+                    )
+                    if not success:
+                        output.warn(merge_msg)
+
                 if action == "next-part":
                     output.ok(f"进入环节: {to_phase}")
                 elif action == "back-part":