context/gauges-hud.md: new section recording the color-drop + shadow-field +
attribute-table-shift fixes for the btploop/btpbus lamps (commit e634709),
with the lesson that gauge value feeds must read named members through a
complete-type bridge, not AttributePointerOf+ResolveLink. Notes the eng-page
GeneratorVoltageConnection as the remaining sibling on the old path.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>