test(daytona): update unit tests for unified execution model

- Update execute tests to account for init_session during __init__
- Fix CWD resolution tests for cwdfile reads
- Patch is_interrupted at base module level (where _wait_for_process uses it)
- Update stdin heredoc test for new call pattern
- 27/27 Daytona unit tests passing

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tools/environments/modal.py

@@ -11,7 +11,6 @@ import os
 import shlex
 import threading
 import uuid
-from dataclasses import dataclass
 from pathlib import Path
 from typing import Any, Dict, Optional