fix: use absolute path for cache dir

src/snowleopard_reid/cache.py

@@ -31,8 +31,10 @@ from snowleopard_reid.visualization import (
 
 logger = logging.getLogger(__name__)
 
-# Cache directory relative to project root
-CACHE_DIR = Path("cached_results")
+# Cache directory - use absolute path based on module location
+# This ensures consistent path resolution regardless of cwd
+PROJECT_ROOT = Path(__file__).parent.parent.parent
+CACHE_DIR = PROJECT_ROOT / "cached_results"
 
 
 def get_cache_key(image_path: Path | str, extractor: str) -> str: