添加cadfs_to_cdsl代码，优化cad生成

cadfs_to_cdsl/tests/test_lowering.py

@@ -30,6 +30,36 @@ class LoweringTests(unittest.TestCase):
         self.assertIsNone(result.cdsl)
         self.assertEqual(result.diagnostics[0]["code"], "unsupported_operation")
 
+    def test_symmetric_cut_is_not_disguised_as_blind_cut(self):
+        source = SOURCE.replace('"depth":120 * mm', '"operationType":NewBodyOperationType.REMOVE, "depth":120 * mm, "symmetric":true')
+        result = lower_model(parse_featurescript(source, "symmetric-cut"), {})
+        self.assertIsNone(result.cdsl)
+        self.assertEqual(result.diagnostics[0]["code"], "unsupported_engine_capability")
+        self.assertEqual(result.diagnostics[0]["capability"], "extrude_cut_two_sided")
+
+    def test_open_nonconstruction_geometry_is_not_silently_dropped(self):
+        source = SOURCE.replace('skSolve(sketch);', 'skLineSegment(sketch, "open", {"start":v(0, 0) * mm, "end":v(20, 0) * mm}); skSolve(sketch);', 1)
+        result = lower_model(parse_featurescript(source, "open-profile"), {})
+        self.assertIsNone(result.cdsl)
+        self.assertEqual(result.diagnostics[0]["code"], "sketch_deferred")
+        self.assertIn("open non-construction", result.diagnostics[0]["message"])
+
+    def test_surface_revolve_is_not_disguised_as_solid_revolve(self):
+        root = Path(__file__).parents[2] / "data/cadfs-sample/CADFS_test"
+        feature = root / "featurescript_rp/0095/00957738.txt"
+        if not feature.exists(): self.skipTest("CADFS sample is not installed")
+        result = lower_model(parse_featurescript(feature.read_text(), "00957738"), {})
+        gap = next(item for item in result.diagnostics if item.get("feature_id") == "F2")
+        self.assertEqual(gap["capability"], "revolve_surface")
+        self.assertIsNone(result.cdsl)
+
+    def test_feature_face_profile_is_not_reused_as_original_sketch(self):
+        source = SOURCE.replace('qSketchRegion(id + "F0", true)', 'makeQuery(id+"F1.opExtrude","CAP_FACE",FACE,{"isStart":false})')
+        result = lower_model(parse_featurescript(source, "face-profile"), {})
+        self.assertIsNone(result.cdsl)
+        self.assertEqual(result.diagnostics[0]["code"], "unsupported_engine_capability")
+        self.assertIn("extrude_profile_topology:cap_face", result.diagnostics[0]["capability"])
+
     def test_conversion_writes_status_and_sidecars(self):
         with tempfile.TemporaryDirectory() as tmp:
             root = Path(tmp); source = root / "00000173.txt"; source.write_text(SOURCE)