fix(recall): initialize IndexService before use

- Add .initialize() call in _get_index() method
- Fixes MemoryIndexError: Database not initialized

Author: zircote

src/git_notes_memory/recall.py

@@ -109,6 +109,7 @@ def _get_index(self) -> IndexService:
             from git_notes_memory.index import IndexService
 
             self._index_service = IndexService(self._index_path)
+            self._index_service.initialize()
         return self._index_service
 
     def _get_embedding(self) -> EmbeddingService: