🐛 fix(vscode): 删 worktree 前扫 /proc 检测进程占用，命中则中止清理

dev server 常驻在 worktree 里持续写构建产物，递归删除与写入竞态导致
rmdir 撞 ENOTEMPTY。新增 findProcessesUsingWorktree 扫 /proc 找 cwd 或
fd 落在 worktree 下的进程，三处删除调用点（拖到完成列 / 手动删 / 删整工单）
命中即弹错误 toast 列出 pid+命令并中止（不删、不杀进程），用户停掉后重试。
非 Linux 无 /proc 返回空，降级为原直接删除。

vscode/src/panel/handlers/issues.ts

@@ -6,7 +6,7 @@ import * as fs from 'node:fs'
 import { promises as fsp } from 'node:fs'
 import * as os from 'node:os'
 import * as path from 'node:path'
-import { removeWorktreeDir, resolveWorktreePath } from '../../git/worktree'
+import { findProcessesUsingWorktree, removeWorktreeDir, resolveWorktreePath } from '../../git/worktree'
 import { commands, env, ThemeColor, Uri, window, workspace } from 'vscode'
 import { getToken } from '../../auth/secrets'
 import { buildCcCommand } from '../../cc/ccCommand'
@@ -475,6 +475,29 @@ export async function handleColumnChange(panel: KanbanWebviewPanel, issueNumber:
         mainBranch: settingsForHook.devBranch || 'main',
         customScriptPath: settingsForHook.worktreePreRemoveScript,
       })
+      // 删前守门：dev server 等仍在写 worktree 的进程会让递归删除撞 ENOTEMPTY。
+      // 命中就别删、别杀进程，只提示并回滚拖拽，让用户停掉后自己重试。
+      const procHits = findProcessesUsingWorktree(abs)
+      if (procHits.length > 0) {
+        const list = procHits
+          .map(h => `  pid ${h.pid}: ${h.cmd.length > 80 ? `${h.cmd.slice(0, 80)}…` : h.cmd}`)
+          .join('\n')
+        logger.add({
+          level: 'warn',
+          source: 'panel',
+          message: `worktree 仍被进程占用，已中止清理 (issue #${issueNumber})`,
+          details: list,
+        })
+        panel.postMessage({
+          type: 'toast/show',
+          id: makeNonce(),
+          level: 'error',
+          message: `工单 #${issueNumber} 有进程仍在占用 worktree，已中止清理。请先停止后重试：\n${list}`,
+          dismissOnTimer: 10000,
+        })
+        rollback(fromColumn)
+        return
+      }
       try {
         await removeWorktreeDir(workspaceRoot, abs)
         logger.add({
@@ -896,6 +919,22 @@ export async function handleDeleteIssue(panel: KanbanWebviewPanel, issueNumber:
         mainBranch: settingsForHook.devBranch || 'main',
         customScriptPath: settingsForHook.worktreePreRemoveScript,
       })
+      // 删整工单也先守门：占用进程会让删除撞 ENOTEMPTY，且底层进程还在跑更不该
+      // 强删。中止并提示，用户停掉后重删（保持与拖拽清理一致：占用就别删）。
+      const procHits = findProcessesUsingWorktree(absWorktree)
+      if (procHits.length > 0) {
+        const list = procHits
+          .map(h => `  pid ${h.pid}: ${h.cmd.length > 80 ? `${h.cmd.slice(0, 80)}…` : h.cmd}`)
+          .join('\n')
+        panel.postMessage({
+          type: 'toast/show',
+          id: makeNonce(),
+          level: 'error',
+          message: `工单 #${issueNumber} 有进程仍在占用 worktree，已中止删除。请先停止后重试：\n${list}`,
+          dismissOnTimer: 10000,
+        })
+        return
+      }
       try {
         await removeWorktreeDir(workspaceRoot, absWorktree)
       }

vscode/src/panel/handlers/worktree.ts

@@ -4,7 +4,7 @@ import { execFile } from 'node:child_process'
 import { commands, Uri, window, workspace } from 'vscode'
 import { getToken } from '../../auth/secrets'
 import { detectRepo } from '../../git/remote'
-import { expandTilde, removeWorktreeDir, resolveWorktreePath } from '../../git/worktree'
+import { expandTilde, findProcessesUsingWorktree, removeWorktreeDir, resolveWorktreePath } from '../../git/worktree'
 import {
   runImplTabPostCloseHook,
   runImplTabPreCreateHook,
@@ -97,6 +97,17 @@ export async function handleDeleteWorktree(panel: KanbanWebviewPanel, issueNumbe
     customScriptPath: settingsForHook.worktreePreRemoveScript,
   })
 
+  // 删前守门：dev server 等仍在写 worktree 的进程会让递归删除撞 ENOTEMPTY。
+  // 命中就别删、别杀进程，只提示，让用户停掉后重试。
+  const procHits = findProcessesUsingWorktree(abs)
+  if (procHits.length > 0) {
+    const list = procHits
+      .map(h => `pid ${h.pid}: ${h.cmd.length > 80 ? `${h.cmd.slice(0, 80)}…` : h.cmd}`)
+      .join('\n')
+    void window.showErrorMessage(`有进程仍在占用 worktree，已中止删除。请先停止后重试：\n${list}`)
+    return
+  }
+
   try {
     await removeWorktreeDir(workspaceRoot, abs)
   }