fix: CacheManager creates cache_dir if it doesn't exist

src/smolvault/cache/cache_manager.py

@@ -7,6 +7,7 @@
 class CacheManager:
     def __init__(self, cache_dir: str) -> None:
         self.cache_dir = pathlib.Path(cache_dir)
+        self.cache_dir.mkdir(exist_ok=True)
         logger.info("Created CacheManager with cache directory %s", self.cache_dir)
 
     def file_exists(self, filename: str) -> bool:

tests/test_cache_manager.py

@@ -0,0 +1,17 @@
+from pathlib import Path
+
+from smolvault.cache.cache_manager import CacheManager
+
+
+def test_create_cache_manager_dir_not_exists(tmp_path: Path) -> None:
+    cache_dir = tmp_path / "cache"
+    cache_mgr = CacheManager(cache_dir.as_posix())
+    assert cache_mgr.cache_dir == cache_dir
+    assert cache_mgr.cache_dir.exists()
+
+
+def test_create_cache_manager_dir__exists(tmp_path: Path) -> None:
+    cache_dir = tmp_path / "existing_cache"
+    cache_dir.mkdir()
+    cache_mgr = CacheManager(cache_dir.as_posix())
+    assert cache_mgr.cache_dir == cache_dir