按推荐建议，继续执行

结论：新增 standalone CNC 语义守卫，禁止在 wrapper/tools/tests 中重新定义 Interp::convert_g()，确保 G-code 转换继续走 vendored LinuxCNC interp_convert.cc。

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

@@ -488,6 +488,11 @@ Current verified progress:
   script compares that map against every `.c` and `.cc` entry in
   `tools/source-manifest.txt`, so future LinuxCNC source additions fail
   validation unless they also get an explicit standalone source compile probe.
+- `tools/verify_no_standalone_cnc_semantics.sh` now guards against
+  reintroducing a standalone `Interp::convert_g()` definition outside
+  `vendor/linuxcnc/`. This keeps G-code group conversion on the vendored
+  LinuxCNC `interp_convert.cc` path instead of allowing the wrapper layer to
+  grow another project-authored conversion implementation.
 
 ## Phase 4: Port INI Parsing Without Editing Upstream
 
@@ -786,8 +791,8 @@ Keep these documents under `wasm-port/docs/`:
 Continue expanding the standalone interpreter core from the verified minimal
 traverse path:
 
-1. replace the temporary minimal `convert_g()` implementation with calls into
-   vendored LinuxCNC interpreter conversion code.
+1. keep `convert_g()` execution on vendored LinuxCNC interpreter conversion
+   code and reject any new standalone `Interp::convert_g()` implementation.
 2. identify and shim the native runtime symbols blocking direct compilation of
    `interp_convert.cc`, `interp_execute.cc`, and related interpreter files.
 3. keep fixture coverage as regression protection while deleting temporary