Adds Carnival, Lumen, Hum, and Cobalt to the catalogue (now 20 themes),
each with its own tokens block, hero archetype, landing copy, and spec doc.
Introduces Custom as a first-class route: when a brief carries real
creative intent, Hallmark designs the whole page from first principles —
palette, type, and structure — rather than recolouring a catalogue theme.
Ships five worked custom examples and a README section.
Rewrites the per-theme landing copy and reconciles every catalogue count
across the site and the skill (20 themes · 21 macrostructures · 50
component archetypes · 70 slop-test gates). Drops the last competitor
references from the CSS comments, fixes the genre rosters, and ignores
the local example explorations so only the featured builds ship.
