按推荐建议，继续执行

结论：将 standalone harness 使用的剩余 rs274ngc 解释器核心源文件纳入 vendored LinuxCNC 直接编译探针，验证迁移边界继续来源于 LinuxCNC 源程序。

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

@@ -450,6 +450,15 @@ Current verified progress:
   `interp_execute.cc`. These probes keep the next interpreter-core migration
   work focused on LinuxCNC source entry points and expose missing standalone
   runtime shims before wrapper behavior is expanded.
+- The direct source compile probes now cover the remaining vendored
+  `rs274ngc` interpreter core files used by the standalone harness:
+  `modal_state.cc`, `interp_array.cc`, `interp_internal.cc`,
+  `interp_arc.cc`, `interp_inverse.cc`, `interp_cycles.cc`,
+  `interp_g7x.cc`, `interp_queue.cc`, `interp_find.cc`,
+  `interp_namedparams.cc`, `interp_write.cc`, `interp_o_word.cc`, and
+  `rs274ngc_pre.cc`. `rs274ngc_pre.cc` is compiled with the existing
+  standalone `UNIT_TEST`/`LINUXCNC_STANDALONE_USE_RS274_PRE_STATE` boundary
+  that isolates Python runtime integration from the browser simulation core.
 
 ## Phase 4: Port INI Parsing Without Editing Upstream