按建议，继续工作

结论：已修正 standalone setup 的 cutter_comp_firstmove 初始态以匹配 vendored LinuxCNC rs274ngc_pre.cc，并新增正向 G41.1/G40 cutter compensation motion fixture；native probe 全量验证通过。

wasm-port/docs/drift-report.md

@@ -55,9 +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.
+- Positive cutter-compensated motion and cutter compensation rejection paths
+  now have standalone interpreter fixture coverage through vendored LinuxCNC
+  source.
 - 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

@@ -394,6 +394,14 @@ Current verified progress:
   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_runtime_state_stubs.cpp` now initializes
+  `setup::cutter_comp_firstmove` to the same initial value as vendored
+  `rs274ngc_pre.cc`, allowing the first cutter-compensated straight move to
+  follow LinuxCNC `interp_convert.cc::convert_straight_comp1()` instead of the
+  subsequent-move path. `tests/fixtures/gcode/cutter_comp_motion.ngc` and
+  `tests/fixtures/canon/cutter_comp_motion.events` pin positive `G41.1`/`G40`
+  compensated straight-feed output through vendored `interp_convert.cc` and
+  `interp_queue.cc`.
 - `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

@@ -41,6 +41,7 @@ G-code fixture coverage includes:
 - canned cycles
 - coordinate offsets
 - feed and motion control modes
+- cutter compensation motion
 - probe semantics
 - spindle-synchronized threading and rigid tap
 - NURBS G5 and G6

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

@@ -66,9 +66,8 @@ 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.
+- Cutter compensation positive motion and negative interpreter paths are
+  fixture-covered through vendored `interp_convert.cc` and `interp_queue.cc`.
 - 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/runtime/core/linuxcnc_wrap/linuxcnc_runtime_state_stubs.cpp

@@ -132,7 +132,7 @@ setup::setup()
       toolchange_flag(0),
       input_index(0),
       input_digital(0),
-      cutter_comp_firstmove(0),
+      cutter_comp_firstmove(true),
       program_x(0.0),
       program_y(0.0),
       program_z(0.0),

wasm-port/tests/fixtures/canon/cutter_comp_motion.events

@@ -0,0 +1,7 @@
+canon_event=SELECT_PLANE plane=1
+canon_event=STRAIGHT_TRAVERSE line=1 x=0 y=0 z=0 a=0 b=0 c=0 u=0 v=0 w=0
+canon_event=COMMENT: interpreter: cutter radius compensation on left
+canon_event=SET_FEED_RATE rate=60
+canon_event=STRAIGHT_FEED line=3 x=0.9 y=0.1 z=0 a=0 b=0 c=0 u=0 v=0 w=0
+canon_event=STRAIGHT_FEED line=4 x=0.9 y=1 z=0 a=0 b=0 c=0 u=0 v=0 w=0
+canon_event=COMMENT: interpreter: cutter radius compensation off

wasm-port/tests/fixtures/gcode/cutter_comp_motion.ngc

@@ -0,0 +1,5 @@
+G90 G17 G0 X0 Y0
+G41.1 D0.2
+G1 X1 Y0 F60
+G1 X1 Y1
+G40