gallery source realm

Package gallery is the platform's gnoweb face (design §2.5.7): the product stays browsable on gno.land even without the website. It is private (re-deployable in place), read-only and holds nothing.

Routes:

1""                    latest collections
2c/<cid>[?page=N]      one collection, 20 tokens per page
3c/<cid>/t/<tid>       one token: art, traits, owner, listing, provenance
4e/<engine pkgpath>    an engine's manifest and status
5u/<name>              a registered user's collections and listings

Every user-supplied string goes through p/nt/markdown/sanitize (RA M-9); every list is paginated.