trash derivative variants, explore original designs for new categories

Removed: dossier, manifest, thermal, contact, specimen, ping, torn,
broadcast — all were cross-pollinated copies with recolored shapes.

Kept: cassette, circuit, blast, terminal (posts), viewfinder, evidence,
hud (shots), packet (bsky), relay, dispatch (links).

New explorations on demo page:
- Posts: microfiche (backlit film viewer), broadsheet (newspaper)
- Shots: polaroid (instant print), slide (35mm mount), proof (crop marks)
- Multi-shot: contact sheet (thumbnail grid), filmstrip (sprocket strip)
- Bsky: gram (telegram/cablegram), sticky (post-it), wire (news bulletin)
- Lists: index card (library catalog), blueprint (white-on-blue spec)
- Log + Feed: existing designs shown for reference