按建议，继续完成后续工作

结论：新增并接入 emcStatus 机器单位边界探针，native 验证链通过。

wasm-port/docs/compatibility-validation.md

@@ -52,6 +52,7 @@ The validation fails if:
 | --- | --- |
 | `linuxcnc_ini_probe` | Validates vendored LinuxCNC INI parsing can be used standalone. |
 | `linuxcnc_interp_state_probe` | Validates interpreter state constants and structs compile under the standalone boundary. |
+| `linuxcnc_emc_status_probe` | Validates the standalone `emcStatus` machine-units status boundary used by vendored interpreter conversion code. |
 | `linuxcnc_namedparam_harness` | Validates LinuxCNC named parameter behavior, `_ini[...]`, and `_hal[...]` adapter resolution. |
 | `linuxcnc_interp_minimal_harness` | Runs G-code fixtures through vendored LinuxCNC parser/execution/conversion code and captures canonical events. |
 | `linuxcnc_parameter_file_harness` | Validates LinuxCNC parameter file restore/save behavior and required/read-only parameter handling. |

wasm-port/docs/drift-report.md

@@ -33,6 +33,7 @@ semantic rewrites:
 | Interpreter reset | LinuxCNC `ON_RESET` is captured as a canonical test event on the vendored interpreter reset/file-open path. |
 | Interpreter init | LinuxCNC `INIT_CANON` and the canonical initialization sequence from vendored `Interp::init()` are captured as test events. |
 | Comment logging | LinuxCNC `LOGOPEN`, `LOG`, `LOGAPPEND`, and `LOGCLOSE` callbacks are captured as canonical test events instead of writing host log files. |
+| EMC status machine units | A narrow standalone `emcStatus` shim exposes the machine-units field used by vendored interpreter conversion code; `linuxcnc_emc_status_probe` guards the inch/mm boundary. |
 | Python/remap | Python/remap hooks are stubbed at the runtime edge. |
 | Dynamic interpreter path | `interp_base.cc` probe uses standalone `EMC2_HOME` compile-time path boundary. |
 | Realtime scheduler | TP probes seed deterministic status/config data instead of running LinuxCNC realtime process topology. |

wasm-port/docs/source-reuse-map.md

@@ -33,7 +33,7 @@ Current validation is intentionally mechanical:
 | --- | --- | --- | --- | --- |
 | INI parsing | `src/emc/ini/inifile.cc`, `inifile.h`, `inifile.hh` | Copy unchanged | Native file IO remains LinuxCNC-style in the vendored parser; browser OPFS integration remains outside this layer | Vendor byte sync, `linuxcnc_ini_probe`, `linuxcnc_inifile_source_probe` |
 | RTAPI compatibility headers | `src/rtapi/rtapi_*.h` in the manifest | Copy unchanged plus standalone shim include path | `runtime/core/shims/rtapi.h` supplies the minimal standalone RTAPI surface needed by vendored code | Vendor byte sync, compile coverage through dependent source probes |
-| Canon/NML-facing interpreter types | `src/emc/nml_intf/canon*.hh`, `emctool.h`, `interp_return.hh`, `motion_types.h`, `emcpose.*`, `emcpos.h`, `debugflags.h`, `src/emc/linuxcnc.h` | Copy unchanged | NML transport is not ported; wrappers provide only the status/type edges needed by standalone probes | Vendor byte sync, dependent source probes, `linuxcnc_tp_api_probe`, interpreter harnesses |
+| Canon/NML-facing interpreter types | `src/emc/nml_intf/canon*.hh`, `emctool.h`, `interp_return.hh`, `motion_types.h`, `emcpose.*`, `emcpos.h`, `debugflags.h`, `src/emc/linuxcnc.h` | Copy unchanged plus narrow standalone status shim | NML transport is not ported; `runtime/core/shims/nml_intf/emc.hh` exposes only the `emcStatus` machine-units status edge currently needed by vendored interpreter conversion code | Vendor byte sync, dependent source probes, `linuxcnc_emc_status_probe`, `linuxcnc_tp_api_probe`, interpreter harnesses |
 | Motion state headers | `src/emc/motion/state_tag.h`, `emcmotcfg.h`, `simple_tp.h`, `motion.h`, `mot_priv.h`, `axis.h` | Copy unchanged | Realtime motion process is not ported; standalone probes seed the small motion status/config state required by TP calls | Vendor byte sync, `linuxcnc_tp_api_probe` |
 | Identity/trivial kinematics | `src/emc/kinematics/kinematics.h`, `cubic.h`, `kins_util.c`, `trivkins.c` | Copy unchanged | HAL component lifecycle and RTAPI module metadata are replaced by standalone shims; forward/inverse mapping behavior remains LinuxCNC source | Vendor byte sync, per-file source probes, `linuxcnc_kinematics_probe` |
 | Switchable 5-axis bridge kinematics | `src/emc/kinematics/5axiskins.c`, `switchkins.c`, `switchkins.h`, `userkfuncs.c`, plus `src/rtapi/rtapi_ctype.h` | Copy unchanged | HAL pin allocation, HAL component lifecycle, and RTAPI module metadata are standalone runtime edges; switchable 5-axis forward/inverse behavior remains LinuxCNC source | Vendor byte sync, per-file source probes, `linuxcnc_5axis_kinematics_probe` |
@@ -53,7 +53,7 @@ Current validation is intentionally mechanical:
 | --- | --- | --- |
 | Native file IO | `inifile.cc`, `rs274ngc_pre.cc`, parameter file paths | Allowed in native probes; browser OPFS remains a host-side future adapter |
 | RTAPI | `rtapi_*.h`, TP, posemath, motion headers | Minimal standalone shim in `runtime/core/shims/rtapi.h` |
-| NML transport | `emc.hh`, motion/NML type headers | Transport is not ported; only structs/types needed by vendored compute code are used |
+| NML transport | `emc.hh`, motion/NML type headers | Transport is not ported; only the status/type edges needed by vendored compute code are exposed through standalone shims and probes |
 | HAL runtime | named parameter lookup, kinematics component lifecycle, and runtime status edges | Standalone HAL adapter under `runtime/core/linuxcnc_wrap/` |
 | Python/remap | `rs274ngc_pre.cc`, `interp_o_word.cc`, remap hooks | Stubbed at runtime boundary; no Python CNC semantics are reimplemented |
 | Canonical machine actions | `interp_convert.cc`, `interp_execute.cc`, `interp_queue.cc` | Captured by standalone canonical event sink functions for regression fixtures |

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

@@ -1,4 +1,39 @@
 #include "nml_intf/emc.hh"
 
+#include <iostream>
+
 static EMC_STAT standalone_emc_status;
 EMC_STAT *emcStatus = &standalone_emc_status;
+
+int main()
+{
+    const bool default_units_visible = emcStatus->motion.traj.linearUnits == 1.0;
+    const bool default_machine_units_mm =
+        emcStatus->motion.traj.linearUnits > 0.5;
+
+    emcStatus->motion.traj.linearUnits = 1.0 / 25.4;
+    const bool inch_machine_units_visible =
+        emcStatus->motion.traj.linearUnits <= 0.5;
+
+    emcStatus->motion.traj.linearUnits = 1.0;
+    const bool mm_machine_units_visible =
+        emcStatus->motion.traj.linearUnits > 0.5;
+
+    std::cout << "emc_status_default_linear_units="
+              << emcStatus->motion.traj.linearUnits << "\n";
+    std::cout << "emc_status_default_units_visible="
+              << default_units_visible << "\n";
+    std::cout << "emc_status_default_machine_units_mm="
+              << default_machine_units_mm << "\n";
+    std::cout << "emc_status_inch_machine_units_visible="
+              << inch_machine_units_visible << "\n";
+    std::cout << "emc_status_mm_machine_units_visible="
+              << mm_machine_units_visible << "\n";
+
+    if (!default_units_visible || !default_machine_units_mm ||
+        !inch_machine_units_visible || !mm_machine_units_visible) {
+        return 1;
+    }
+
+    return 0;
+}

wasm-port/tests/native/verify_native_probes.sh

@@ -77,6 +77,8 @@ check_exitcode() {
 
 check_source_probe_coverage
 check_exitcode linuxcnc_interp_state_probe
+check_exitcode linuxcnc_emc_status_probe
+check_exitcode linuxcnc_emc_status_probe.run
 check_exitcode linuxcnc_inifile_source_probe
 check_exitcode linuxcnc_tp_api_probe
 check_exitcode linuxcnc_tp_api_probe.run
@@ -202,6 +204,13 @@ check_exitcode linuxcnc_rs274ngc_pre_source_probe
 check_exitcode linuxcnc_interp_base_source_probe
 check_exitcode linuxcnc_gomath_source_probe
 
+EMC_STATUS_STDOUT="$BUILD_DIR/linuxcnc_emc_status_probe.run.stdout.log"
+grep -Fq "emc_status_default_linear_units=1" "$EMC_STATUS_STDOUT"
+grep -Fq "emc_status_default_units_visible=1" "$EMC_STATUS_STDOUT"
+grep -Fq "emc_status_default_machine_units_mm=1" "$EMC_STATUS_STDOUT"
+grep -Fq "emc_status_inch_machine_units_visible=1" "$EMC_STATUS_STDOUT"
+grep -Fq "emc_status_mm_machine_units_visible=1" "$EMC_STATUS_STDOUT"
+
 NAMEDPARAM_STDOUT="$BUILD_DIR/linuxcnc_namedparam_harness.run.stdout.log"
 grep -Fq "init_named_parameters=0" "$NAMEDPARAM_STDOUT"
 grep -Fq "global_named_count=57" "$NAMEDPARAM_STDOUT"

wasm-port/tools/build_native_probes.sh

@@ -342,6 +342,10 @@ STATE_PROBE_SOURCES=(
   "$WRAP_DIR/linuxcnc_interp_state_probe.cpp"
 )
 
+EMC_STATUS_PROBE_SOURCES=(
+  "$WRAP_DIR/linuxcnc_emc_status_probe.cpp"
+)
+
 TP_API_PROBE_SOURCES=(
   "$WRAP_DIR/linuxcnc_tp_api_probe.cpp"
 )
@@ -660,6 +664,28 @@ build_binary_target \
   STATE_PROBE_SOURCES \
   NO_LINK_FLAGS
 
+build_binary_target \
+  linuxcnc_emc_status_probe \
+  "$BUILD_DIR/linuxcnc_emc_status_probe" \
+  COMMON_FLAGS \
+  EMC_STATUS_PROBE_SOURCES \
+  NO_LINK_FLAGS
+
+if [[ "$(tr -d '[:space:]' < "$BUILD_DIR/linuxcnc_emc_status_probe.exitcode")" == "0" ]]; then
+  set +e
+  "$BUILD_DIR/linuxcnc_emc_status_probe" \
+    >"$BUILD_DIR/linuxcnc_emc_status_probe.run.stdout.log" \
+    2>"$BUILD_DIR/linuxcnc_emc_status_probe.run.stderr.log"
+  EMC_STATUS_RUN_RC=$?
+  set -e
+  echo "$EMC_STATUS_RUN_RC" > "$BUILD_DIR/linuxcnc_emc_status_probe.run.exitcode"
+else
+  rm -f \
+    "$BUILD_DIR/linuxcnc_emc_status_probe.run.exitcode" \
+    "$BUILD_DIR/linuxcnc_emc_status_probe.run.stdout.log" \
+    "$BUILD_DIR/linuxcnc_emc_status_probe.run.stderr.log"
+fi
+
 build_binary_target \
   linuxcnc_tp_api_probe \
   "$BUILD_DIR/linuxcnc_tp_api_probe" \