refactor(harness): route workflow persistence through repositories

harness/tests/test_sql_preview_json.py

@@ -108,16 +108,12 @@ def test_do_run_offset_zero_path_unchanged(monkeypatch):
 
 
 def test_preview_session_no_file_resolves_sql_final(monkeypatch, tmp_path, capsys):
-    """--session without a positional FILE resolves sql_final.sql via _session_sql_file."""
+    """--session without a positional FILE resolves repository SQL text."""
     from types import SimpleNamespace
 
     from tht.cli import sql_cmd
 
-    sql_file = tmp_path / "sql_final.sql"
-    sql_file.write_text("SELECT session_resolved")
-
-    # Patch _session_sql_file to return our tmp file (no real workspace/DB needed).
-    monkeypatch.setattr(sql_cmd, "_session_sql_file", lambda cfg, sid: sql_file)
+    monkeypatch.setattr(sql_cmd, "_session_sql", lambda cfg, sid: "SELECT session_resolved")
 
     captured_sql = {}