fix(management): serialize lifecycle maintenance paths

- serialize deleteInstance with the same profile and plugin-layout locks as ensure

- lock non-account marketplace normalization paths and ignore .locks as an instance source

src/utils/shell-executor.ts

@@ -125,7 +125,7 @@ export function execClaude(
 
   if (profileType !== 'account') {
     try {
-      new SharedManager().normalizeSharedPluginMetadataPaths(env.CLAUDE_CONFIG_DIR);
+      new SharedManager().normalizeSharedPluginMetadataPathsLocked(env.CLAUDE_CONFIG_DIR);
     } catch {
       // Best-effort normalization should never block Claude launch.
     }