probe: name the MathNode fields; the build baseline is now one warning

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CMakeLists.txt

@@ -151,7 +151,7 @@ add_custom_command(
 # The generated source carries each file as one C string literal, and a `.ui` is big enough to pass the
 # 4095-character minimum the standard requires a compiler to support: `-Woverlength-strings` fires on
 # generated *data*, not on anything anyone wrote. Silenced for this one generated file (the icon bundle
-# is small enough per file never to need it), so the build stays at its three warnings. The manual is
+# is small enough per file never to need it), so the build stays at its one warning. The manual is
 # no longer compiled in, so the help bundle's own warning is gone with it.
 set_source_files_properties(${CMAKE_CURRENT_BINARY_DIR}/udpscope_ui_resources.c
                             PROPERTIES COMPILE_OPTIONS "-Wno-overlength-strings")