docs(specs): add the widget component-generation spec (DRAFT)

The collection phase closed at 84 verified cards, so porting needs a decision procedure before consumer work starts. The spec carries the agreed five phases (demand inventory, web library extraction, Emacs ports, waybar audio pilot, Level-2 generator go/no-go) and records the baked architecture decisions. I left the web library's packaging shape as the one open decision, tracked as a VERIFY in todo.org. The gallery is the prototype evidence, with the R-series history as the iteration record.

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