docs: record the component taxonomy and the alphanumeric survey

Crossing Foley's elemental tasks against cardinality over the kit finds two empty cells: selecting one of a dynamic set (the device and network lists) and alphanumeric text entry (a WiFi password). Panels that already exist want both.

The cross needed an axis the note didn't carry. Cardinality lumps all one-of-N together, so a chicken-head selector and a WiFi list share a cell that then reads as covered. Set stability is what separates them. The axis is invisible from inside hardware, where every option set is engraved at manufacture. That's why a catalogue modelled on period gear goes blind exactly where its software consumers live.

The period answer to a changing set was never a control but a re-labelable slot: jukebox title strips, Rolodex cards, scribble strips. The slot is manufactured, the label isn't.

Reference photos supersede the teletype for text entry. They're all ABC-order industrial keypads, whose colour-coded CANCEL, CLEAR/NO and ENTER/YES land on the palette untranslated. A survey adds two idioms unlike a keypad: the index typewriter, which selects on one control and commits on another, and the chorded keyset, which has no key per letter at all.

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