Windows CMD: EJ_RUNNER_PWD persists between Junie sessions causing subsequent launches to open the previous project

[efernandes-tech]

Environment:

• Windows 10
• Junie CLI 26.6.29
• CMD

Steps to reproduce:

1. Open CMD.
2. Navigate to Project A.
3. Run junie.
4. Exit Junie (Ctrl+C).
5. Navigate to Project B.
6. Run:
   echo %EJ_RUNNER_PWD%

Actual result:
EJ_RUNNER_PWD still points to Project A.
Junie opens Project A instead of using the current working directory.

Expected result:
EJ_RUNNER_PWD should not persist between sessions.
Each junie invocation should use the current %CD%.