按规划继续工作

结论：扩展 position_params 的 MDI 与 file-path 期望，固定 vendored LinuxCNC 执行后的 modal、override、spindle、mist、flood 状态读回，并同步验证文档。

wasm-port/docs/drift-report.md

@@ -98,8 +98,8 @@ semantic rewrites:
   fixtures; it also covers threading/rigid tap, NURBS dispatch boundaries, and
   comparable canonical runtime edge and program-end cleanup calls. The
   vendored-source native harness plus Node WASM and browser smokes also pin
-  the `canon_runtime_edges` post-program modal, override, spindle, mist, and
-  flood `_setup` state. It now also checks the negative fixture set
+  the `position_params` MDI/file-path and `canon_runtime_edges` post-program
+  modal, override, spindle, mist, and flood `_setup` state. It now also checks the negative fixture set
   against upstream `rs274 -g` for expected error text and absent canonical
   event constraints.
   HAL-backed adapter-heavy fixtures, standalone modal-state assertions, and upstream