转向直接移植LinuxCNC源程序

结论：明确禁止继续扩展自写 CNC 主体语义，最小 runtime 仅保留为迁移探针；新增 interp_convert.cc 源码直连编译探针，并以最小 emcStatus 状态边界 shim 暴露 native runtime 阻塞点。检查：git diff --check 通过；wasm-port/tests/native/verify_native_probes.sh 通过，linuxcnc_interp_convert_source_probe exitcode=0。

wasm-port/tools/build_native_probes.sh

@@ -31,7 +31,11 @@ rm -f \
   "$BUILD_DIR/linuxcnc_rs274_compile_probe.o" \
   "$BUILD_DIR/linuxcnc_rs274_compile_probe.exitcode" \
   "$BUILD_DIR/linuxcnc_rs274_compile_probe.stdout.log" \
-  "$BUILD_DIR/linuxcnc_rs274_compile_probe.stderr.log"
+  "$BUILD_DIR/linuxcnc_rs274_compile_probe.stderr.log" \
+  "$BUILD_DIR/linuxcnc_interp_convert_source_probe.o" \
+  "$BUILD_DIR/linuxcnc_interp_convert_source_probe.exitcode" \
+  "$BUILD_DIR/linuxcnc_interp_convert_source_probe.stdout.log" \
+  "$BUILD_DIR/linuxcnc_interp_convert_source_probe.stderr.log"
 
 g++ -std=c++20 -O2 \
   -D_GNU_SOURCE \
@@ -160,4 +164,26 @@ RS274_RC=$?
 set -e
 
 echo "$RS274_RC" > "$BUILD_DIR/linuxcnc_rs274_compile_probe.exitcode"
+
+set +e
+g++ -std=c++20 -O2 \
+  -D_GNU_SOURCE \
+  -DM_PI=3.14159265358979323846 \
+  -DOBJECT_FWD_DWA2002724_HPP \
+  -I"$SHIM_DIR" \
+  -I"$INCLUDE_DIR" \
+  -I"$VENDOR_DIR/src" \
+  -I"$VENDOR_DIR/src/rtapi" \
+  -I"$VENDOR_DIR/src/emc" \
+  -I"$VENDOR_DIR/src/emc/nml_intf" \
+  -I"$VENDOR_DIR/src/emc/motion" \
+  -I"$VENDOR_DIR/src/libnml/posemath" \
+  -c "$VENDOR_DIR/src/emc/rs274ngc/interp_convert.cc" \
+  -o "$BUILD_DIR/linuxcnc_interp_convert_source_probe.o" \
+  >"$BUILD_DIR/linuxcnc_interp_convert_source_probe.stdout.log" \
+  2>"$BUILD_DIR/linuxcnc_interp_convert_source_probe.stderr.log"
+CONVERT_SOURCE_RC=$?
+set -e
+
+echo "$CONVERT_SOURCE_RC" > "$BUILD_DIR/linuxcnc_interp_convert_source_probe.exitcode"
 echo "native probes complete"