refactor(harness): route workflow persistence through repositories

harness/tests/test_repository_memory_sql_paths.py

@@ -0,0 +1,16 @@
+"""Repository-only workflow commands must not recover server state via session_dir."""
+
+import inspect
+
+from tht.cli import memory_cmd, sql_cmd
+
+
+def test_memory_workflow_commands_do_not_import_or_call_session_dir():
+    source = inspect.getsource(memory_cmd)
+    assert "session_dir" not in source
+
+
+def test_sql_session_commands_read_snapshot_artifacts_not_session_paths():
+    source = inspect.getsource(sql_cmd)
+    assert "_session_sql_file" not in source
+    assert "session_dir" not in source