Add missing utils.py with ensure_dir function

.gitignore

@@ -0,0 +1,21 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+
+# Distribution / packaging
+*.egg-info/
+dist/
+build/
+
+# Database
+*.db
+
+# IDE
+.idea/
+.vscode/
+*.swp
+
+# Testing
+.pytest_cache/
+.coverage
+htmlcov/

src/docflow/utils.py

@@ -0,0 +1,9 @@
+from __future__ import annotations
+from pathlib import Path
+
+
+def ensure_dir(path: str | Path) -> Path:
+    """Ensure the directory exists, creating it if necessary."""
+    p = Path(path)
+    p.mkdir(parents=True, exist_ok=True)
+    return p