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

wasm-port/runtime/core/linuxcnc_wrap/linuxcnc_interp_minimal_runtime.cpp

@@ -234,8 +234,21 @@ void STOP_SPINDLE_TURNING(int spindle)
     standalone::push_canon_event(oss.str());
 }
 void SPINDLE_RETRACT() {}
-void ORIENT_SPINDLE(int, double, int) {}
+void ORIENT_SPINDLE(int spindle, double orientation, int mode)
-void WAIT_SPINDLE_ORIENT_COMPLETE(int, double) {}
+{
+    std::ostringstream oss;
+    oss << "ORIENT_SPINDLE spindle=" << spindle
+        << " orientation=" << orientation
+        << " mode=" << mode;
+    standalone::push_canon_event(oss.str());
+}
+void WAIT_SPINDLE_ORIENT_COMPLETE(int spindle, double timeout)
+{
+    std::ostringstream oss;
+    oss << "WAIT_SPINDLE_ORIENT_COMPLETE spindle=" << spindle
+        << " timeout=" << timeout;
+    standalone::push_canon_event(oss.str());
+}
 void LOCK_SPINDLE_Z() {}
 void USE_SPINDLE_FORCE() {}
 void USE_NO_SPINDLE_FORCE() {}

wasm-port/tests/fixtures/canon/spindle_orient.events

@@ -0,0 +1,4 @@
+canon_event=SELECT_PLANE plane=1
+canon_event=STRAIGHT_TRAVERSE line=1 x=0 y=0 z=0 a=0 b=0 c=0 u=0 v=0 w=0
+canon_event=ORIENT_SPINDLE spindle=0 orientation=45 mode=2
+canon_event=WAIT_SPINDLE_ORIENT_COMPLETE spindle=0 timeout=1.5

wasm-port/tests/fixtures/gcode/spindle_orient.ngc

@@ -0,0 +1,2 @@
+G90 G17 G0 X0 Y0 Z0
+M19 R45 P2 Q1.5