fix(test): correct import path in constants.test.mts

Fixed import path from ../constants/env.mts to ./constants/env.mts

Root Cause:
- Test file is in /src/, constants folder is in /src/constants/
- Parent directory path would go up to packages/cli/ incorrectly
- Same directory path correctly resolves to src/constants/

Test now passes successfully.

Author: jdalton

packages/cli/src/constants.test.mts

@@ -1,6 +1,6 @@
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 
-import ENV from '../constants/env.mts'
+import ENV from './constants/env.mts'
 
 // Mock environment variables before importing constants.
 vi.stubEnv('SOCKET_API_BASE_URL', '')