register adom-footprint-variants (john/footprint-widgets): footprint-variant family viewer parsed from kicad_mod files
Register adom-symbol-variants (frontend widget from adom/adom-symbol): alternate symbol layouts generated in the browser
Document the /widget-script serving path (raw registry URLs are repo pointers, not reader URLs; #155)
Seed the registry (adom/wiki#152): the four component-widgets, schema docs, the tag contract
Initial commit: app/widgets