按推荐建议，继续执行

结论：已接入 LinuxCNC probe canonical 边界事件记录，并新增 G38.2、G38.3、G38.4、G38.5 回归 fixture；原生 probe 验证通过。

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

@@ -389,6 +389,13 @@ Current verified progress:
   `G95`, `G61`, `G61.1`, and `G64 P/Q` behavior from
   `interp_convert.cc::convert_feed_mode()`,
   `interp_convert.cc::convert_control_mode()`, and `interp_queue.cc`.
+- `runtime/core/linuxcnc_wrap/linuxcnc_interp_minimal_runtime.cpp` now records
+  probe canonical boundary calls emitted by vendored
+  `interp_convert.cc::convert_probe()`: `TURN_PROBE_ON`,
+  `STRAIGHT_PROBE`, and `TURN_PROBE_OFF`.
+  `tests/fixtures/gcode/probe_semantics.ngc` and
+  `tests/fixtures/canon/probe_semantics.events` pin `G38.2`, `G38.3`,
+  `G38.4`, and `G38.5` probe type handling.
 - `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

@@ -157,7 +157,26 @@ void STOP_CUTTER_RADIUS_COMPENSATION() {}
 void START_SPEED_FEED_SYNCH(int, double, bool) {}
 void STOP_SPEED_FEED_SYNCH() {}
 void RIGID_TAP(int, double, double, double, double) {}
-void STRAIGHT_PROBE(int, double, double, double, double, double, double, double, double, double, unsigned char) {}
+void STRAIGHT_PROBE(int lineno,
+                    double x, double y, double z,
+                    double a, double b, double c,
+                    double u, double v, double w,
+                    unsigned char probe_type)
+{
+    std::ostringstream oss;
+    oss << "STRAIGHT_PROBE line=" << lineno
+        << " x=" << x
+        << " y=" << y
+        << " z=" << z
+        << " a=" << a
+        << " b=" << b
+        << " c=" << c
+        << " u=" << u
+        << " v=" << v
+        << " w=" << w
+        << " probe_type=" << static_cast<int>(probe_type);
+    standalone::push_canon_event(oss.str());
+}
 void STOP() {}
 void DWELL(double seconds)
 {
@@ -264,8 +283,8 @@ void FLOOD_ON() { standalone::push_canon_event("FLOOD_ON"); }
 void MIST_OFF() { standalone::push_canon_event("MIST_OFF"); }
 void MIST_ON() { standalone::push_canon_event("MIST_ON"); }
 void PALLET_SHUTTLE() { standalone::push_canon_event("PALLET_SHUTTLE"); }
-void TURN_PROBE_OFF() {}
-void TURN_PROBE_ON() {}
+void TURN_PROBE_OFF() { standalone::push_canon_event("TURN_PROBE_OFF"); }
+void TURN_PROBE_ON() { standalone::push_canon_event("TURN_PROBE_ON"); }
 void UNCLAMP_AXIS(CANON_AXIS) {}
 void NURB_KNOT_VECTOR() {}
 void NURB_CONTROL_POINT(int, double, double, double, double) {}

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

@@ -0,0 +1,15 @@
+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=SET_FEED_RATE rate=25
+canon_event=TURN_PROBE_ON
+canon_event=STRAIGHT_PROBE line=3 x=0 y=0 z=-1 a=0 b=0 c=0 u=0 v=0 w=0 probe_type=0
+canon_event=TURN_PROBE_OFF
+canon_event=TURN_PROBE_ON
+canon_event=STRAIGHT_PROBE line=4 x=1 y=0 z=0 a=0 b=0 c=0 u=0 v=0 w=0 probe_type=1
+canon_event=TURN_PROBE_OFF
+canon_event=TURN_PROBE_ON
+canon_event=STRAIGHT_PROBE line=5 x=0 y=1 z=0 a=0 b=0 c=0 u=0 v=0 w=0 probe_type=2
+canon_event=TURN_PROBE_OFF
+canon_event=TURN_PROBE_ON
+canon_event=STRAIGHT_PROBE line=6 x=0 y=0 z=1 a=0 b=0 c=0 u=0 v=0 w=0 probe_type=3
+canon_event=TURN_PROBE_OFF

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

@@ -0,0 +1,6 @@
+G90 G17 G0 X0 Y0 Z0
+F25
+G38.2 Z-1
+G38.3 X1
+G38.4 Y1
+G38.5 Z1