按建议继续完成后续工作

结论：upstream rs274 side-by-side 基线已扩展到 program-end cleanup canonical 调用；standalone modal-state assertions 仍由 harness 覆盖，完整 native 验证已通过。

wasm-port/tools/verify_native_linuxcnc_fixture_baseline.sh

@@ -24,6 +24,7 @@ FIXTURES=(
   oword_subroutine
   percent_file_finish
   position_params
+  program_end_modal_reset
   spindle_orient
   threading_sync
   tool_reload
@@ -333,6 +334,11 @@ normalize_standalone_events() {
           split(fields[i], pair, "=")
           values[pair[1]] = pair[2]
         }
+        if (!("x" in values)) {
+          print fields[1]
+          delete values
+          next
+        }
         print fields[1] "|" norm(values["x"]) "|" norm(values["y"]) "|" \
           norm(values["z"]) "|" norm(values["a"]) "|" norm(values["b"]) "|" \
           norm(values["c"])
@@ -597,6 +603,10 @@ normalize_upstream_rs274_output() {
         sub(/\(.*/, "", op)
         args = args_of(line)
         split(args, values, ",")
+        if (op in sparse_ops) {
+          print op
+          next
+        }
         print op "|" norm(values[1]) "|" norm(values[2]) "|" norm(values[3]) "|" \
           norm(values[4]) "|" norm(values[5]) "|" norm(values[6])
         next
@@ -662,6 +672,39 @@ for name in "${FIXTURES[@]}"; do
 
   normalize_upstream_rs274_output < "$native_raw" > "$native_norm"
   normalize_standalone_events < "$expected_file" > "$expected_norm"
+  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"
+    awk '
+      NR == FNR {
+        sparse_ops[$0] = 1
+        next
+      }
+
+      {
+        key = $0
+        sub(/\|.*/, "", key)
+        if (key in sparse_ops) {
+          print key
+        } else {
+          print
+        }
+      }
+    ' "$sparse_ops_file" "$native_norm" > "$TMP_DIR/$name.rs274.sparse"
+    mv "$TMP_DIR/$name.rs274.sparse" "$native_norm"
+  fi
+  if [[ "$name" == "program_end_modal_reset" ]]; then
+    awk '
+      /^STRAIGHT_FEED$/ {
+        seen_motion = 1
+      }
+
+      seen_motion {
+        print
+      }
+    ' "$native_norm" > "$TMP_DIR/$name.rs274.program-end"
+    mv "$TMP_DIR/$name.rs274.program-end" "$native_norm"
+  fi
   filter_to_expected_event_keys "$expected_norm" < "$native_norm" > "$native_filtered"
 
   if [[ ! -s "$native_filtered" ]]; then