按建议继续完成后续工作

结论：upstream rs274 side-by-side 基线已扩展到 program-end cleanup canonical 调用；standalone modal-state assertions 仍由 harness 覆盖，完整 native 验证已通过。

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

@@ -508,12 +508,13 @@ Current verified progress:
   comment/logging, numbered-parameter, spindle-orient, file-finish, and
   tool-reload fixtures. It now also includes file-open reset and O-word
   subroutine fixture coverage, threading/rigid tap coverage, NURBS dispatch
-  boundary coverage, plus comparable canonical runtime edge calls. Native
-  output is filtered to the event classes each standalone fixture explicitly
-  expects, while upstream `rs274` output gaps such as `WAIT` and hidden NURBS
-  control-point detail remain covered by the standalone harness rather than
-  being treated as side-by-side evidence. The comparison does not introduce a
-  project-authored CNC semantics oracle.
+  boundary coverage, comparable canonical runtime edge calls, and the
+  program-end cleanup calls emitted after `M2`. Native output is filtered to
+  the event classes each standalone fixture explicitly expects, while upstream
+  `rs274` output gaps such as `WAIT`, hidden NURBS control-point detail, and
+  standalone modal-state assertions remain covered by the standalone harness
+  rather than being treated as side-by-side evidence. The comparison does not
+  introduce a project-authored CNC semantics oracle.
 - `tests/fixtures/gcode_errors/g1_zero_feed.ngc` and
   `tests/fixtures/canon_errors/g1_zero_feed.expected` pin the negative
   `G1` zero-feed case. The source basis is LinuxCNC