按建议，继续完成后续工作

结论：tool_semantics 的 T/M6/G43/G49 canonical 子集已通过 rs274 -t -i 纳入 upstream side-by-side baseline，M61 host-state 行为继续由 standalone fixture 验证，完整 native probes 验证通过。

wasm-port/docs/compatibility-validation.md

@@ -124,20 +124,22 @@ The current fixture expectations validate standalone behavior against both the
 vendored LinuxCNC source path and an upstream `rs274` side-by-side baseline for
 parser/conversion, arc geometry, offsets, feed-control, comment/logging,
 numbered-parameter, probing, spindle-orient, file-open reset, file-finish,
-tool-reload, canned-cycle, state-tag motion, tool-table setup, and O-word
+tool-reload, tool select/change/length-offset, canned-cycle, state-tag motion,
-subroutine fixtures, plus threading/rigid tap, NURBS dispatch boundaries, and
+tool-table setup, and O-word subroutine fixtures, plus threading/rigid tap,
-the comparable canonical runtime edge and program-end cleanup calls. Fixtures
+NURBS dispatch boundaries, and the comparable canonical runtime edge and
-that depend on standalone-only runtime adapters, HAL/INI/tool-change state,
+program-end cleanup calls. Fixtures that depend on standalone-only runtime
-upstream `rs274` output gaps such as `WAIT` or hidden NURBS control-point
+adapters, HAL/INI/tool-change state, upstream `rs274` output gaps such as
-detail, or richer machine session state still need dedicated native LinuxCNC
+`WAIT` or hidden NURBS control-point detail, or richer machine session state
-baselines.
+still need dedicated native LinuxCNC baselines.
 
 Remaining positive fixtures that are not in the upstream `rs274` side-by-side
 baseline are intentionally held out until they get a dedicated native LinuxCNC
 baseline: `namedparam_semantics` depends on standalone INI/HAL adapter
-resolution, and `tool_semantics` depends on tool-change host state.
+resolution. `state_tag_motion` now compares its motion events with upstream
-`state_tag_motion` now compares its motion events with upstream `rs274`, while
+`rs274`, while `UPDATE_TAG` events remain a standalone state-tag capture
-`UPDATE_TAG` events remain a standalone state-tag capture boundary.
+boundary. `tool_semantics` now compares T/M6/G43/G49 canonical events with
+upstream `rs274`; M61 current-pocket host-state behavior remains covered by the
+standalone fixture expectation.
 
 The kinematics probes currently cover LinuxCNC identity/trivial kinematics, the
 switchable `5axiskins` XYZBCW bridge-mill model, TRT `xyzac`/`xyzbc`

wasm-port/docs/drift-report.md

@@ -69,9 +69,10 @@ semantic rewrites:
   path. The upstream `rs274` side-by-side baseline now covers simple motion,
   arc geometry, offsets, feed-control, comment/logging, numbered-parameter,
   probing, spindle-orient, file-open reset, file-finish, tool-reload, and
-  canned-cycle, state-tag motion, tool-table setup, and O-word subroutine
+  tool select/change/length-offset, canned-cycle, state-tag motion, tool-table
-  fixtures; it also covers threading/rigid tap, NURBS dispatch boundaries, and
+  setup, and O-word subroutine fixtures; it also covers threading/rigid tap,
-  comparable canonical runtime edge and program-end cleanup calls.
+  NURBS dispatch boundaries, and comparable canonical runtime edge and
+  program-end cleanup calls.
   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.
@@ -80,6 +81,9 @@ semantic rewrites:
   default `G73/G83` peck-clearance values for millimeter units.
 - `tool_table_setup` is now in the upstream `rs274` side-by-side baseline using
   a dedicated `rs274 -t` tool table and `-i` millimeter-unit INI boundary.
+- `tool_semantics` now compares its T/M6/G43/G49 canonical subset with
+  upstream `rs274 -t -i`; M61 current-pocket host-state behavior remains a
+  standalone fixture expectation.
 
 ## Current Drift Conclusion
 

wasm-port/tools/verify_native_linuxcnc_fixture_baseline.sh

@@ -31,6 +31,7 @@ FIXTURES=(
   spindle_orient
   state_tag_motion
   threading_sync
+  tool_semantics
   tool_table_setup
   tool_reload
 )
@@ -101,6 +102,11 @@ normalize_standalone_events() {
         next
       }
 
+      if (line == "CHANGE_TOOL") {
+        print line
+        next
+      }
+
       if (line ~ /^NURBS_G5_FEED /) {
         print "NURBS_G5_FEED"
         next
@@ -217,6 +223,39 @@ normalize_standalone_events() {
         next
       }
 
+      if (line ~ /^SELECT_TOOL /) {
+        split(line, fields, /[[:space:]]+/)
+        for (i in fields) {
+          split(fields[i], pair, "=")
+          values[pair[1]] = pair[2]
+        }
+        print "SELECT_TOOL|" values["tool"]
+        delete values
+        next
+      }
+
+      if (line ~ /^CHANGE_TOOL_NUMBER /) {
+        split(line, fields, /[[:space:]]+/)
+        for (i in fields) {
+          split(fields[i], pair, "=")
+          values[pair[1]] = pair[2]
+        }
+        print "CHANGE_TOOL_NUMBER|" values["pocket"]
+        delete values
+        next
+      }
+
+      if (line ~ /^USE_TOOL_LENGTH_OFFSET /) {
+        split(line, fields, /[[:space:]]+/)
+        for (i in fields) {
+          split(fields[i], pair, "=")
+          values[pair[1]] = pair[2]
+        }
+        print "USE_TOOL_LENGTH_OFFSET|" norm(values["x"]) "|" norm(values["y"]) "|" norm(values["z"])
+        delete values
+        next
+      }
+
       if (line ~ /^(ENABLE|DISABLE)_SPEED_OVERRIDE /) {
         split(line, fields, /[[:space:]]+/)
         for (i in fields) {
@@ -490,6 +529,11 @@ normalize_upstream_rs274_output() {
         next
       }
 
+      if (line == "CHANGE_TOOL()") {
+        print "CHANGE_TOOL"
+        next
+      }
+
       if (line ~ /^(MIST_ON|MIST_OFF|FLOOD_ON|FLOOD_OFF|ENABLE_FEED_OVERRIDE|DISABLE_FEED_OVERRIDE|DISABLE_ADAPTIVE_FEED|ENABLE_ADAPTIVE_FEED|DISABLE_FEED_HOLD|ENABLE_FEED_HOLD|PROGRAM_STOP|PROGRAM_END)\(\)$/) {
         value = line
         sub(/\(\)$/, "", value)
@@ -562,6 +606,27 @@ normalize_upstream_rs274_output() {
         next
       }
 
+      if (line ~ /^SELECT_TOOL\(/) {
+        args = args_of(line)
+        print "SELECT_TOOL|" trim(args)
+        next
+      }
+
+      if (line ~ /^CHANGE_TOOL_NUMBER\(/) {
+        args = args_of(line)
+        print "CHANGE_TOOL_NUMBER|" trim(args)
+        next
+      }
+
+      if (line ~ /^USE_TOOL_LENGTH_OFFSET\(/) {
+        args = args_of(line)
+        split(args, groups, ",")
+        gsub(/[[:space:]]+/, " ", groups[1])
+        split(trim(groups[1]), offset, " ")
+        print "USE_TOOL_LENGTH_OFFSET|" norm(offset[1]) "|" norm(offset[2]) "|" norm(offset[3])
+        next
+      }
+
       if (line ~ /^(ENABLE|DISABLE)_SPEED_OVERRIDE\(/) {
         op = line
         sub(/\(.*/, "", op)
@@ -760,7 +825,7 @@ for name in "${FIXTURES[@]}"; do
   fi
 
   set +e
-  if [[ "$name" == "tool_table_setup" ]]; then
+  if [[ "$name" == "tool_table_setup" || "$name" == "tool_semantics" ]]; then
     "$UPSTREAM_RS274" -g -i "$TOOL_TABLE_INI" -t "$TOOL_TABLE_BASELINE" "$gcode_file" > "$native_raw" 2>&1
   else
     "$UPSTREAM_RS274" -g "$gcode_file" > "$native_raw" 2>&1
@@ -782,6 +847,12 @@ for name in "${FIXTURES[@]}"; do
     mv "$TMP_DIR/$name.rs274.no-comments" "$native_norm"
     mv "$TMP_DIR/$name.expected.no-comments" "$expected_norm"
   fi
+  if [[ "$name" == "tool_semantics" ]]; then
+    grep -Ev '^(CHANGE_TOOL_NUMBER|MESSAGE\| tool after_m61)' "$native_norm" > "$TMP_DIR/$name.rs274.tool-subset"
+    grep -Ev '^(CHANGE_TOOL_NUMBER|MESSAGE\| tool after_m61)' "$expected_norm" > "$TMP_DIR/$name.expected.tool-subset"
+    mv "$TMP_DIR/$name.rs274.tool-subset" "$native_norm"
+    mv "$TMP_DIR/$name.expected.tool-subset" "$expected_norm"
+  fi
   if grep -Eq '^STRAIGHT_(TRAVERSE|FEED)$' "$expected_norm"; then
     sparse_ops_file="$TMP_DIR/$name.sparse_ops"
     grep -E '^STRAIGHT_(TRAVERSE|FEED)$' "$expected_norm" > "$sparse_ops_file"