参考所有分组，完成尽量多的内容：结论为 WASM source probe 禁止夹带 smoke 后端

docs/linuxcnc-source-policy.md

@@ -65,6 +65,9 @@ Efficiency rules:
   permission to expand the pass into another workstream.
 - Do not add a smoke-only behavior path when the LinuxCNC-backed route already
   exists; add coverage to the source-backed route instead.
+- The legacy explicit smoke backend must not be enabled together with the
+  LinuxCNC wasm-safe source probe; browser/WASM builds must keep the LinuxCNC
+  source-linked path separate from the temporary smoke parser.
 - Keep browser filesystem guardrails negative as well as positive: require the
   OPFS bridge and reject browser app/wasm storage APIs that could bypass it.
 - Smoke tests are verification guardrails. They must not be expanded with new