fix(xcodemake): Avoid global cwd mutation during build setup

Run xcodemake with per-process cwd instead of process.chdir to prevent

cross-request working-directory races in concurrent execution.

Add regression tests to verify executeXcodemakeCommand leaves process cwd

unchanged and forwards cwd to the command executor.

Refs #206

Author: cameroncooke

src/utils/__tests__/xcodemake.test.ts

@@ -0,0 +1,49 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+
+const { executorMock } = vi.hoisted(() => ({
+  executorMock: vi.fn(),
+}));
+
+vi.mock('../command.ts', () => ({
+  getDefaultCommandExecutor: () => executorMock,
+}));
+
+import { executeXcodemakeCommand } from '../xcodemake.ts';
+
+describe('executeXcodemakeCommand', () => {
+  beforeEach(() => {
+    executorMock.mockReset();
+  });
+
+  it('runs xcodemake using child-process cwd without mutating process cwd', async () => {
+    const projectDir = '/tmp/project';
+    const originalCwd = process.cwd();
+    executorMock.mockResolvedValue({ success: true, output: 'ok' });
+
+    await executeXcodemakeCommand(
+      projectDir,
+      ['-scheme', 'App', '-project', '/tmp/project/App.xcodeproj'],
+      'Build',
+    );
+
+    expect(executorMock).toHaveBeenCalledWith(
+      ['xcodemake', '-scheme', 'App', '-project', 'App.xcodeproj'],
+      'Build',
+      false,
+      { cwd: projectDir },
+    );
+    expect(process.cwd()).toBe(originalCwd);
+  });
+
+  it('does not mutate process cwd when command execution fails', async () => {
+    const projectDir = '/tmp/project';
+    const originalCwd = process.cwd();
+    executorMock.mockRejectedValue(new Error('xcodemake failed'));
+
+    await expect(executeXcodemakeCommand(projectDir, ['-scheme', 'App'], 'Build')).rejects.toThrow(
+      'xcodemake failed',
+    );
+
+    expect(process.cwd()).toBe(originalCwd);
+  });
+});

src/utils/xcodemake.ts

@@ -206,9 +206,6 @@ export async function executeXcodemakeCommand(
   buildArgs: string[],
   logPrefix: string,
 ): Promise<CommandResponse> {
-  // Change directory to project directory, this is needed for xcodemake to work
-  process.chdir(projectDir);
-
   const xcodemakeCommand = [getXcodemakeCommand(), ...buildArgs];
 
   // Remove projectDir from arguments if present at the start
@@ -220,7 +217,7 @@ export async function executeXcodemakeCommand(
     return arg;
   });
 
-  return getDefaultCommandExecutor()(command, logPrefix);
+  return getDefaultCommandExecutor()(command, logPrefix, false, { cwd: projectDir });
 }
 
 /**