fix: align git mount implementation with spec

- _checkout_branch now returns bool and falls back gracefully on failure
- Glob warning message includes matched file count
- Fix database model comment to reference remote_url
- Update tests for new branch checkout behavior

All 51 tests pass

apps/api/src/api/tool_instances.py

@@ -143,11 +143,14 @@ async def _resolve_single_git_mount(
     
     # Handle branch checkout if specified
     if branch and repo_path:
-        try:
-            await asyncio.to_thread(_checkout_branch, repo_path, branch)
+        success = await asyncio.to_thread(_checkout_branch, repo_path, branch)
+        if success:
             logger.info("Checked out branch %s for %s", branch, remote_url)
-        except Exception as exc:
-            logger.warning("Branch checkout failed for %s@%s: %s", remote_url, branch, exc)
+        else:
+            logger.warning(
+                "Branch %s not found in %s, using current branch",
+                branch, remote_url
+            )
     
     # Build source path and expand globs
     if source_path and source_path != ".":
@@ -186,8 +189,12 @@ async def _resolve_single_git_mount(
     return volume_mounts
 
 
-def _checkout_branch(repo_path: str, branch: str) -> None:
-    """Checkout a specific branch in a git repository."""
+def _checkout_branch(repo_path: str, branch: str) -> bool:
+    """Checkout a specific branch in a git repository.
+    
+    Returns True if checkout succeeded, False if it failed.
+    On failure, the repository remains on its current branch.
+    """
     import subprocess
     
     # First try to checkout existing branch
@@ -211,7 +218,10 @@ def _checkout_branch(repo_path: str, branch: str) -> None:
         )
         
         if result.returncode != 0:
-            raise RuntimeError(f"Failed to checkout branch {branch}: {result.stderr}")
+            logger.warning("Failed to checkout branch %s in %s: %s", branch, repo_path, result.stderr.strip())
+            return False
+    
+    return True
 
 
 def _pull_repository_updates(repo_path: str, remote_url: str) -> None:
@@ -258,6 +268,7 @@ def _expand_glob_source(source_path: str, repo_path: str) -> list[str]:
     
     # Expand glob pattern
     matched = glob_module.glob(source_path, recursive=True)
+    total_matched = len(matched)
     
     # Filter to only paths within the repo and limit count
     results = []
@@ -266,7 +277,7 @@ def _expand_glob_source(source_path: str, repo_path: str) -> list[str]:
         if abs_path.startswith(os.path.abspath(repo_path)):
             results.append(abs_path)
         if len(results) >= MAX_GLOB_MATCHES:
-            logger.warning("Glob pattern matched too many files, limiting to %d", MAX_GLOB_MATCHES)
+            logger.warning("Glob pattern matched %d files, limited to %d", total_matched, MAX_GLOB_MATCHES)
             break
     
     return results

apps/api/src/models/config_profile.py

@@ -41,7 +41,7 @@ class ConfigProfile(UUIDPrimaryKeyMixin, TimestampMixin, Base):
     )  # {"rel/path": "content", ...}
     git_mounts: Mapped[list] = mapped_column(
         JSON, default=list, nullable=False
-    )  # [{"repo_id": "uuid", "source_path": ".", "target_path": "/path", "branch": "main"}, ...]
+    )  # [{"remote_url": "https://github.com/user/repo.git", "source_path": ".", "target_path": "/path", "branch": "main"}, ...]
     is_default: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
 
     user: Mapped["User"] = relationship()