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/SKILL.md

@@ -38,6 +38,8 @@ Use this skill when the work involves any of the following:
 4. Native runtime dependencies are replaced at the edges, not copied whole.
 5. Machine state and controller-visible behavior are first-class compatibility
    targets, not optional nice-to-haves.
+6. Do not continue building a project-authored CNC program once the porting
+   harness runs; move behavior back to vendored LinuxCNC source functions.
 
 ## Source Reuse Priorities
 
@@ -96,6 +98,16 @@ Preferred order of work:
 6. Build the WASM export layer second.
 7. Build the JS SDK and HTML frontend last.
 
+Current migration emphasis:
+
+- Treat `linuxcnc_interp_minimal_runtime.cpp` as a temporary probe surface.
+- Retire hand-written `convert_g()` behavior by linking and calling vendored
+  LinuxCNC interpreter conversion code.
+- Add shims only for host/runtime edges that prevent vendored LinuxCNC source
+  from compiling.
+- Do not add new G-code behavior in JavaScript or in standalone C++ wrappers
+  except as a short-lived adapter around LinuxCNC code.
+
 ## Filesystem And Browser Guidance
 
 For browser use: