按建议，继续完成后续工作

结论：tool_semantics 的 T/M6/G43/G49 canonical 子集已通过 rs274 -t -i 纳入 upstream side-by-side baseline，M61 host-state 行为继续由 standalone fixture 验证，完整 native probes 验证通过。

wasm-port/docs/drift-report.md

@@ -69,9 +69,10 @@ semantic rewrites:
   path. The upstream `rs274` side-by-side baseline now covers simple motion,
   arc geometry, offsets, feed-control, comment/logging, numbered-parameter,
   probing, spindle-orient, file-open reset, file-finish, tool-reload, and
-  canned-cycle, state-tag motion, tool-table setup, and O-word subroutine
-  fixtures; it also covers threading/rigid tap, NURBS dispatch boundaries, and
-  comparable canonical runtime edge and program-end cleanup calls.
+  tool select/change/length-offset, canned-cycle, state-tag motion, tool-table
+  setup, and O-word subroutine fixtures; it also covers threading/rigid tap,
+  NURBS dispatch boundaries, and comparable canonical runtime edge and
+  program-end cleanup calls.
   Adapter-heavy fixtures, standalone modal-state assertions, and upstream
   `rs274` output gaps such as `WAIT` or hidden NURBS control-point detail still
   need dedicated native LinuxCNC baselines.
@@ -80,6 +81,9 @@ semantic rewrites:
   default `G73/G83` peck-clearance values for millimeter units.
 - `tool_table_setup` is now in the upstream `rs274` side-by-side baseline using
   a dedicated `rs274 -t` tool table and `-i` millimeter-unit INI boundary.
+- `tool_semantics` now compares its T/M6/G43/G49 canonical subset with
+  upstream `rs274 -t -i`; M61 current-pocket host-state behavior remains a
+  standalone fixture expectation.
 
 ## Current Drift Conclusion