feat(worktree): add Git worktree support for isolated parallel sessions (#22973)

packages/core/src/utils/memoryImportProcessor.ts

@@ -48,16 +48,16 @@ export interface ProcessImportsResult {
   importTree: MemoryFile;
 }
 
-// Helper to find the project root (looks for .git directory)
+// Helper to find the project root (looks for .git directory or file for worktrees)
 async function findProjectRoot(startDir: string): Promise<string> {
   let currentDir = path.resolve(startDir);
   while (true) {
     const gitPath = path.join(currentDir, '.git');
     try {
-      const stats = await fs.lstat(gitPath);
-      if (stats.isDirectory()) {
-        return currentDir;
-      }
+      // Check for existence only — .git can be a directory (normal repos)
+      // or a file (submodules / worktrees).
+      await fs.access(gitPath);
+      return currentDir;
     } catch {
       // .git not found, continue to parent
     }