fix(027): stabilize shared acceptance gates and compatibility collateral

backend/src/services/git_service.py

@@ -50,6 +50,7 @@ class GitService:
         with belief_scope("GitService.__init__"):
             backend_root = Path(__file__).parents[2]
             self.legacy_base_path = str((backend_root / "git_repos").resolve())
+            self._uses_default_base_path = base_path == "git_repos"
             self.base_path = self._resolve_base_path(base_path)
             self._ensure_base_path_exists()
     # [/DEF:backend.src.services.git_service.GitService.__init__:Function]
@@ -281,6 +282,9 @@ class GitService:
             normalized_key = self._normalize_repo_key(fallback_key)
             target_path = os.path.join(self.base_path, normalized_key)
 
+            if not self._uses_default_base_path:
+                return target_path
+
             try:
                 session = SessionLocal()
                 try:
@@ -345,10 +349,14 @@ class GitService:
                     logger.warning(
                         f"[init_repo][Action] Existing path is not a Git repository, recreating: {repo_path}"
                     )
-                    if os.path.isdir(repo_path):
-                        shutil.rmtree(repo_path)
-                    else:
-                        os.remove(repo_path)
+                    stale_path = Path(repo_path)
+                    if stale_path.exists():
+                        shutil.rmtree(stale_path, ignore_errors=True)
+                        if stale_path.exists():
+                            try:
+                                stale_path.unlink()
+                            except Exception:
+                                pass
                     repo = Repo.clone_from(auth_url, repo_path)
                 self._ensure_gitflow_branches(repo, dashboard_id)
                 return repo