执行 AGENTS align-linuxcnc 加速规则

结论：补齐 WASM NML status shim 并增加可执行 runtime 探针，依据 LinuxCNC src/libnml/nml/nmlmsg.cc 和 stat_msg.cc 中 RCS_GENERIC_STATUS/RCS_STAT_MSG 构造初始化。验证通过：./test-linuxcnc-wasm-runtime-link.sh、./test-native.sh、./test-linuxcnc-source-link.sh。

core/wasm_shims/cnc_sim_wasm_runtime_probe_main.cc

@@ -1,5 +1,6 @@
 #include "cnc_sim_api.h"
 #include "hal.h"
+#include "libnml/nml/stat_msg.hh"
 
 #include <cmath>
 #include <cstdlib>
@@ -116,6 +117,18 @@ bool hal_lookup_is_unavailable() {
     return true;
 }
 
+bool nml_status_constructors_match_linuxcnc() {
+    // LinuxCNC source basis: src/libnml/nml/nmlmsg.cc and stat_msg.cc
+    // initialize RCS status messages before EMC status objects use them.
+    RCS_GENERIC_STATUS status;
+    return status._type == RCS_GENERIC_STATUS_TYPE &&
+           status.size == static_cast<long>(sizeof(RCS_GENERIC_STATUS)) &&
+           status.command_type == -1 &&
+           status.echo_serial_number == -1 &&
+           status.status == RCS_STATUS::UNINITIALIZED &&
+           status._state == -1;
+}
+
 } // namespace
 
 int main() {
@@ -131,6 +144,9 @@ int main() {
     if (!hal_lookup_is_unavailable()) {
         return 7;
     }
+    if (!nml_status_constructors_match_linuxcnc()) {
+        return 9;
+    }
 
     std::vector<CncSimEvent> events;
     CncSimHandle *sim = cnc_sim_create();

core/wasm_shims/nml_status_shim.cc

@@ -71,3 +71,10 @@ RCS_STAT_MSG::RCS_STAT_MSG(NMLTYPE t, size_t sz) : NMLmsg(t, sz) {
     status = RCS_STATUS::UNINITIALIZED;
     _state = -1;
 }
+
+RCS_GENERIC_STATUS::RCS_GENERIC_STATUS()
+    : RCS_STAT_MSG(RCS_GENERIC_STATUS_TYPE, sizeof(RCS_GENERIC_STATUS)) {
+}
+
+void RCS_GENERIC_STATUS::update(CMS *) {
+}