fix(ui): route answer worktrees from source session

packages/ui/src/lib/worktrees/worktreeCreate.ts

@@ -1,8 +1,15 @@
-import { getGitBranches, getGitStatus } from '@/lib/gitApi';
+import { checkIsGitRepository, getGitBranches, getGitStatus } from '@/lib/gitApi';
 import type { CreateWorktreeArgs, ProjectRef } from '@/lib/worktrees/worktreeManager';
 import { createWorktree } from '@/lib/worktrees/worktreeManager';
 import { getRootBranch, resolveProjectRoot } from '@/lib/worktrees/worktreeStatus';
 
+export class WorktreeRequiresGitRepositoryError extends Error {
+  constructor() {
+    super('Worktree creation requires a Git repository');
+    this.name = 'WorktreeRequiresGitRepositoryError';
+  }
+}
+
 const parseTrackingRef = (tracking: string | null | undefined): { remote: string; branch: string } | null => {
   const value = String(tracking || '').trim().replace(/^remotes\//, '');
   if (!value) {
@@ -162,6 +169,10 @@ export const createWorktreeWithDefaults = async (
   args: CreateWorktreeArgs,
   options?: { resolvedRootTrackingRemote?: string | null }
 ) => {
+  const isGitRepository = await checkIsGitRepository(project.path);
+  if (!isGitRepository) {
+    throw new WorktreeRequiresGitRepositoryError();
+  }
   const remoteArgs = await withWorktreeRemoteStartRef(project, args);
   const resolvedArgs = await withWorktreeUpstreamDefaults(project.path, remoteArgs, options);
   return createWorktree(project, resolvedArgs);