Fix Windows compatibility: subprocess support and long path handling

Author: BareninVitalya

src/gitingest/utils/git_utils.py

@@ -8,6 +8,7 @@
 import sys
 from pathlib import Path
 from typing import TYPE_CHECKING, Final, Iterable
+import sys
 from urllib.parse import urlparse
 
 import httpx
@@ -85,7 +86,7 @@ async def ensure_git_installed() -> None:
     Raises
     ------
     RuntimeError
-        If Git is not installed or not accessible.
+        If Git is not installed or not accessible, or if enabling long paths fails.
 
     """
     try: