按建议，继续工作

结论：已新增 cutter compensation 平面切换拒绝 fixture，固定 vendored LinuxCNC convert_cutter_compensation_on() 与 convert_set_plane() 的错误路径；native probe 全量验证通过。

wasm-port/docs/drift-report.md

@@ -55,6 +55,9 @@ semantic rewrites:
 - Full machine baselines beyond the current identity/trivial, `5axiskins`,
   TRT, delta, SCARA, PUMA, serial `genserkins`, hexapod `genhexkins`,
   pentapod `pentakins`, and other existing runtime probes are not established.
+- Positive cutter-compensated motion is not yet a standalone runtime baseline;
+  current cutter compensation coverage is limited to vendored interpreter
+  rejection paths.
 - Fixture expectations are currently checked against the standalone vendored
   source path, not by running a native LinuxCNC binary for every fixture.
 

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

@@ -388,6 +388,12 @@ Current verified progress:
   `tests/fixtures/canon/plane_selection.events` pin `G17`/`G18`/`G19` plane
   switching and the `SELECT_PLANE` canonical boundary emitted by vendored
   `interp_convert.cc::convert_set_plane()`.
+- `tests/fixtures/gcode_errors/cutter_comp_plane_change.ngc` and
+  `tests/fixtures/canon_errors/cutter_comp_plane_change.expected` pin the
+  LinuxCNC error path for attempting a plane change after `G41.1` enables
+  cutter radius compensation. The source basis is vendored
+  `interp_convert.cc::convert_cutter_compensation_on()` and
+  `interp_convert.cc::convert_set_plane()`.
 - `runtime/core/linuxcnc_wrap/linuxcnc_interp_minimal_runtime.cpp` now records
   feed/control canonical boundary calls emitted by vendored LinuxCNC
   conversion and queue code: `SET_TRAVERSE_RATE`, `SET_FEED_REFERENCE`,

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

@@ -56,6 +56,7 @@ Negative fixture coverage includes:
 - zero-feed `G1`
 - arc radius mismatch
 - zero-radius arc
+- cutter compensation plane-change rejection
 - read-only named parameter writes
 - read-only numbered parameter writes
 - missing tool

wasm-port/docs/source-reuse-map.md

@@ -66,6 +66,9 @@ Current validation is intentionally mechanical:
   source-probe level. Serial `genserkins`, hexapod `genhexkins`, and pentapod
   `pentakins` have native runtime baselines; full runtime machine baselines for
   userspace genser flows are not yet established.
+- Cutter compensation negative interpreter paths are fixture-covered through
+  vendored `interp_convert.cc`, but a positive cutter-compensated motion
+  runtime baseline is not yet established for the standalone harness.
 - Browser/WASM C ABI and JS SDK layers are not yet built for the full
   interpreter/planner core.
 - OPFS persistence is not yet connected to INI, tool table, parameter file, or

wasm-port/tests/fixtures/canon_errors/cutter_comp_plane_change.expected

@@ -0,0 +1,6 @@
+execute_line_1=0
+execute_line_2=0
+execute_line_3=5
+error_text=Cannot change planes with cutter radius compensation on
+canon_event=COMMENT: interpreter: cutter radius compensation on left
+absent=canon_event=SELECT_PLANE plane=3

wasm-port/tests/fixtures/gcode_errors/cutter_comp_plane_change.ngc

@@ -0,0 +1,3 @@
+G90 G17 G0 X0 Y0
+G41.1 D0.2
+G18