按建议持续推进

结论：已接入 LinuxCNC speed/feed synchronization 与 rigid tap canonical 边界事件记录，并新增 G33、G33.1 回归 fixture；原生 probe 验证通过。

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

@@ -396,6 +396,13 @@ Current verified progress:
   `tests/fixtures/gcode/probe_semantics.ngc` and
   `tests/fixtures/canon/probe_semantics.events` pin `G38.2`, `G38.3`,
   `G38.4`, and `G38.5` probe type handling.
+- `runtime/core/linuxcnc_wrap/linuxcnc_interp_minimal_runtime.cpp` now records
+  speed/feed synchronization and rigid-tap canonical boundary calls emitted by
+  vendored `interp_convert.cc::convert_straight()`: `START_SPEED_FEED_SYNCH`,
+  `STOP_SPEED_FEED_SYNCH`, and `RIGID_TAP`.
+  `tests/fixtures/gcode/threading_sync.ngc` and
+  `tests/fixtures/canon/threading_sync.events` pin `G33` spindle-synchronized
+  straight feed and `G33.1` rigid tap behavior.
 - `tests/fixtures/gcode_errors/g1_zero_feed.ngc` and
   `tests/fixtures/canon_errors/g1_zero_feed.expected` pin the negative
   `G1` zero-feed case. The source basis is LinuxCNC