feat(gallery): add R29 guarded toggle

The critical-switch idiom after a flight-deck panel (reference filed in the catalogue's working directory): cast guard posts flank the lever and a red collar marks it critical. The guard is the point — friction sized to consequence, the physical cousin of the kit's arm-to-fire confirm. A second reference (an SCE-style switch with a rectangular guard plate) confirmed the idiom while it was being built.

I verified it in headless Chrome: the lever throws both ways with legends relighting, no console exceptions.

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