按规划继续工作

结论：将现有负向 G-code fixture 纳入 upstream rs274 -g side-by-side 基线，校验错误文本和 absent canonical 事件约束，继续保持解释器语义来源于 LinuxCNC。

wasm-port/docs/scope-and-baseline.md

@@ -65,6 +65,9 @@ Negative fixture coverage includes:
 - missing tool
 - missing tool length offset
 
+The native baseline compares those negative fixtures with upstream
+`rs274 -g` for expected error text and absent canonical-event constraints.
+
 Machine baseline is still limited to standalone interpreter, trajectory
 planner, LinuxCNC identity/trivial kinematics, LinuxCNC `5axiskins` XYZBCW
 bridge-mill probing, and LinuxCNC TRT `xyzac`/`xyzbc` probing. Additional