Recover task metadata store schema on startup

tests/test_task_metadata.py

@@ -0,0 +1,10 @@
+from storage.task_metadata import TaskMetadataStore
+
+
+def test_store_recovers_from_preexisting_empty_database(tmp_path) -> None:
+    path = tmp_path / "task_progress.sqlite3"
+    path.touch()
+
+    store = TaskMetadataStore(path)
+
+    assert store.list_tasks() == []