几何引擎新增open_slot功能。

backend/engine/cdsl_engine/capabilities.py

@@ -20,18 +20,20 @@ _SELECTOR_REQUIRED = frozenset({"fillet", "chamfer"})
 _SKETCH_ATOM_PREFIXES = ("extrude_", "revolve_")
 _PRIMARY_ATOMICS = frozenset({
     "extrude_add_blind", "extrude_add_two_sided", "extrude_cut_blind",
+    "extrude_cut_through",
     "revolve_add", "revolve_cut", "hole_blind", "hole_countersink",
     "hole_counterbore", "sphere_add", "box_add", "cylinder_add",
 })
 _HOLE_ATOMICS = frozenset({"hole_blind", "hole_countersink", "hole_counterbore", "hole_wizard"})
 _ACTIVE_BODY_REQUIRED = frozenset({
-    "extrude_cut_blind", "revolve_cut", *_HOLE_ATOMICS, "fillet", "chamfer",
+    "extrude_cut_blind", "extrude_cut_through", "revolve_cut", *_HOLE_ATOMICS, "fillet", "chamfer",
     # thread_cut 是 cut 型特征：必须在已有主体（宿主）上做布尔差，不能凭空
     # 造实体；无宿主时按 active_body 前置阻止而非让 executor 在 None 上崩溃。
     "thread_cut",
 })
 _BODY_MUTATING_ATOMICS = frozenset({
     "extrude_add_blind", "extrude_add_two_sided", "extrude_cut_blind",
+    "extrude_cut_through",
     "revolve_add", "revolve_cut", "sphere_add", "box_add", "cylinder_add",
     "thread_add", "thread_cut", *_HOLE_ATOMICS, "fillet", "chamfer",
 })