feat(cadfs): 补齐核心建模能力并建立代表性回归

- 新增 loft、双向切除、through-all/up-to-next 等 CADFS lowering 与 engine 支持
- 支持多种 reference plane、B-spline profile 和 circular pattern replay
- 保留 transform 历史，并烘焙安全的单源平移/旋转变换
- 改进 selector 绑定、拓扑快照和 pattern 变换处理
- 建立 17 个代表样本的转换、重建与比较回归工具链
- 补充 schema、author guidance、运行时和几何回归测试

cadfs_to_cdsl/tests/test_selector_binding.py

@@ -0,0 +1,24 @@
+from __future__ import annotations
+
+import unittest
+
+from cadfs_to_cdsl.selector_binding import _score
+
+
+class SelectorBindingTests(unittest.TestCase):
+    def test_face_normal_match_is_orientation_independent(self) -> None:
+        score = _score(
+            {"normal": [0.0, 0.0, 1.0], "plane_offset_mm": 12.0},
+            {"normal": [0.0, 0.0, -1.0], "plane_offset_mm": 12.0},
+        )
+        self.assertEqual(score, 1.0)
+
+    def test_axis_direction_remains_orientation_sensitive(self) -> None:
+        score = _score(
+            {"axis_direction": [0.0, 0.0, 1.0]},
+            {"axis_direction": [0.0, 0.0, -1.0]},
+        )
+        self.assertEqual(score, 0.0)
+
+    def test_empty_snapshot_score_is_not_treated_as_a_match(self) -> None:
+        self.assertEqual(_score({}, {"normal": [0.0, 0.0, 1.0]}), 0.0)