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/compatibility-validation.md

@@ -266,6 +266,11 @@ Negative fixtures currently cover:
 - missing tool
 - missing tool length offset
 
+The negative fixture expectations are also checked against upstream
+`rs274 -g`: the baseline requires LinuxCNC to reject each program, to emit the
+expected error text, and to omit the canonical event lines marked as absent in
+`tests/fixtures/canon_errors/`.
+
 ## Validation Boundaries
 
 Current full-core validation is native-only. WASM/SDK validation covers the
@@ -520,7 +525,9 @@ numbered-parameter, local named-parameter plus `_ini[...]` lookup through
 tool-reload, tool select/change/length-offset, canned-cycle, state-tag motion,
 tool-table setup, and O-word subroutine fixtures, plus threading/rigid tap,
 NURBS dispatch boundaries, and the comparable canonical runtime edge and
-program-end cleanup calls. Fixtures that depend on standalone-only runtime
+program-end cleanup calls. The same upstream baseline also validates the
+current negative fixture error text and absent canonical-event constraints.
+Fixtures that depend on standalone-only runtime
 adapters, HAL/tool-change state, upstream `rs274` output gaps such as
 `WAIT` or hidden NURBS control-point detail, or richer machine session state
 still need dedicated native LinuxCNC baselines.

wasm-port/docs/drift-report.md

@@ -96,7 +96,9 @@ semantic rewrites:
   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.
+  program-end cleanup calls. 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
   `rs274` output gaps such as `WAIT` or hidden NURBS control-point detail still
   need dedicated native LinuxCNC baselines.

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