按建议，继续工作

结论：已新增 cutter compensation 平面切换拒绝 fixture，固定 vendored LinuxCNC convert_cutter_compensation_on() 与 convert_set_plane() 的错误路径；native probe 全量验证通过。

wasm-port/docs/porting-steps-standalone.md

@@ -388,6 +388,12 @@ Current verified progress:
   `tests/fixtures/canon/plane_selection.events` pin `G17`/`G18`/`G19` plane
   switching and the `SELECT_PLANE` canonical boundary emitted by vendored
   `interp_convert.cc::convert_set_plane()`.
+- `tests/fixtures/gcode_errors/cutter_comp_plane_change.ngc` and
+  `tests/fixtures/canon_errors/cutter_comp_plane_change.expected` pin the
+  LinuxCNC error path for attempting a plane change after `G41.1` enables
+  cutter radius compensation. The source basis is vendored
+  `interp_convert.cc::convert_cutter_compensation_on()` and
+  `interp_convert.cc::convert_set_plane()`.
 - `runtime/core/linuxcnc_wrap/linuxcnc_interp_minimal_runtime.cpp` now records
   feed/control canonical boundary calls emitted by vendored LinuxCNC
   conversion and queue code: `SET_TRAVERSE_RATE`, `SET_FEED_REFERENCE`,