按推荐建议，继续执行

结论：已接入 LinuxCNC spindle orient canonical 边界事件记录，并新增 M19 R/P/Q 回归 fixture；原生 probe 验证通过。

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

@@ -415,6 +415,12 @@ Current verified progress:
   `tests/fixtures/gcode/nurbs_g6_semantics.ngc` and
   `tests/fixtures/canon/nurbs_g6_semantics.events` pin `G6.2` order,
   interpolation mode, control-point, weight, and K segment handling.
+- `runtime/core/linuxcnc_wrap/linuxcnc_interp_minimal_runtime.cpp` now records
+  spindle-orient canonical boundary calls emitted by vendored LinuxCNC
+  conversion and queue code: `ORIENT_SPINDLE` and
+  `WAIT_SPINDLE_ORIENT_COMPLETE`. `tests/fixtures/gcode/spindle_orient.ngc`
+  and `tests/fixtures/canon/spindle_orient.events` pin `M19 R/P/Q` behavior
+  from `interp_convert.cc::convert_m()` and `interp_queue.cc`.
 - `tests/fixtures/gcode_errors/g1_zero_feed.ngc` and
   `tests/fixtures/canon_errors/g1_zero_feed.expected` pin the negative
   `G1` zero-feed case. The source basis is LinuxCNC