提交关于N5功能，“involute_gear渐开线齿廓与齿条专用生成”的改动

backend/engine/cdsl_engine/capabilities.py

@@ -39,15 +39,15 @@ _BODY_MUTATING_ATOMICS = frozenset({
     "extrude_add_blind", "extrude_add_two_sided", "extrude_cut_blind", "extrude_cut_two_sided",
     "extrude_cut_through", "loft_add",
     "revolve_add", "revolve_cut", "sphere_add", "box_add", "cylinder_add",
-    "thread_add", "thread_cut", "bend_add", *_HOLE_ATOMICS, "fillet", "chamfer",
+    "thread_add", "thread_cut", "bend_add", "gear_add", "rack_add", *_HOLE_ATOMICS, "fillet", "chamfer",
 })
 # A pattern may replay a previous pattern as well as a direct body mutation.
 # Context-only features have no geometry definition to instance.  thread_add,
-# thread_cut and bend_add are excluded: pattern translation does not yet move
-# their parametric axis/frame, so a replayed instance would silently re-run at
-# the original location.
+# thread_cut, bend_add, gear_add and rack_add are excluded: pattern
+# translation does not yet move their parametric axis/frame, so a replayed
+# instance would silently re-run at the original location.
 _REPLAYABLE_ATOMICS = (
-    _BODY_MUTATING_ATOMICS - frozenset({"thread_add", "thread_cut", "bend_add"})
+    _BODY_MUTATING_ATOMICS - frozenset({"thread_add", "thread_cut", "bend_add", "gear_add", "rack_add"})
 ) | frozenset({"pattern_linear", "pattern_mirror", "pattern_circular"})
 _SUPPORTED_EXTENTS = frozenset({
     "blind", "mid_plane", "through_all", "through_all_both", "through_all_and_blind",
@@ -532,7 +532,7 @@ class CapabilityAnalyzer:
             "extrude_add_blind", "extrude_add_two_sided", "extrude_cut_blind", "extrude_cut_two_sided",
             "extrude_cut_through", "loft_add",
             "revolve_add", "revolve_cut", "sphere_add", "box_add", "cylinder_add",
-            "thread_add", "bend_add",
+            "thread_add", "bend_add", "gear_add", "rack_add",
             # thread_cut 与 extrude_cut_blind/revolve_cut 一致：无宿主时由
             # active_body 前置阻止，文档含该类特征即视为携带可执行几何。
             "thread_cut",