feat: complete catalog-driven preprocessing

harness/tests/test_schema_introspect_guard.py

@@ -81,11 +81,11 @@ def test_introspect_corrupt_catalog_falls_through(tmp_path):
     assert "OK (cache)" not in res.output
 
 
-def test_render_without_catalog_guides_fallback(tmp_path):
+def test_render_without_schema_source_fails_closed(tmp_path):
     cfg = _write_config(tmp_path)
     res = CliRunner().invoke(app, ["schema", "render", "-c", str(cfg)])
     assert res.exit_code == 1
-    assert "Esegui prima" in res.output
+    assert "physical schema is missing" in res.output
 
 
 def test_examples_skip_one_unreadable_column_and_continue(caplog):