- detect ast_file_version_too_new/old as pcm-mismatch
- new src/llvmTools.ts: xlings detection, version extraction, path derivation
- autoConfigureModulesWizard: 8-step guided setup (check toolchain →
  install matching llvm-tools via xlings → configure clangd → rebuild)
- status bar '模块不可用' now shows context-aware QuickPick with auto-fix
- enhanced pcm-mismatch error message with actionable guidance
- McppOperationRegistry.hasActive() and McppCliController.isBusy()
- executeXlingsInstallTask() helper for xlings vscode.Task execution

version 0.2.2

- wizard 检测到 GCC/MSVC: error 消息说明原因 + 提供安装/选择工具链入口
- 状态栏点击 GCC 项目: QuickPick 提供一键配置/安装/选择默认工具链
- 模块检查 interactive 模式: warning 消息带一键配置按钮形成闭环

…check

- createSerialExecutor: use AsyncLocalStorage-scoped flag instead of global
  depth counter so only same-async-context reentrant calls bypass the queue
- findXlingsExecutable: check PATH entries with existsSync before returning
  'xlings', so the wizard's 'install xlings' guidance branch is reachable
- add 2 tests: concurrent caller queues correctly, reentrant call bypasses

- changelog: 0.2.2 entry covering one-click auto-configure, PCM mismatch
  detection, non-LLVM toolchain UX, serial executor fix, xlings detection
- README: update version to 0.2.2, add mcpp.autoConfigureModules to
  command table, add auto-configure to troubleshooting and LLVM integration
  sections, update roadmap and release tag example