按建议，继续工作

结论：已修正 standalone setup 的 cutter_comp_firstmove 初始态以匹配 vendored LinuxCNC rs274ngc_pre.cc，并新增正向 G41.1/G40 cutter compensation motion fixture；native probe 全量验证通过。

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

@@ -394,6 +394,14 @@ Current verified progress:
   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_runtime_state_stubs.cpp` now initializes
+  `setup::cutter_comp_firstmove` to the same initial value as vendored
+  `rs274ngc_pre.cc`, allowing the first cutter-compensated straight move to
+  follow LinuxCNC `interp_convert.cc::convert_straight_comp1()` instead of the
+  subsequent-move path. `tests/fixtures/gcode/cutter_comp_motion.ngc` and
+  `tests/fixtures/canon/cutter_comp_motion.events` pin positive `G41.1`/`G40`
+  compensated straight-feed output through vendored `interp_convert.cc` and
+  `interp_queue.cc`.
 - `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`,