按建议继续完成后续工作

结论：upstream rs274 side-by-side 基线已继续扩展到 file-open reset 和 O-word subroutine fixture；完整 native 验证已通过。

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

@@ -506,7 +506,8 @@ Current verified progress:
   side-by-side baseline against upstream `../linuxcnc/bin/rs274`. It normalizes
   native LinuxCNC canonical output for simple motion, offsets, feed-control,
   comment/logging, numbered-parameter, spindle-orient, file-finish, and
-  tool-reload fixtures, filters native output to the event classes each
+  tool-reload fixtures. It now also includes file-open reset and O-word
+  subroutine fixture coverage, filters native output to the event classes each
   standalone fixture explicitly expects, and compares the result without
   introducing a project-authored CNC semantics oracle.
 - `tests/fixtures/gcode_errors/g1_zero_feed.ngc` and