TinyWorld Tinyverse collectibles

Two app routes:

1. Build / Freeplay — editable sandbox. World menu: Create new (blank grass), Create default (default_island.json). Generate-from-prompt stays. No pack economy, no collectible reveal, no gold scoring on this path.
2. Tinyverse — collectibles. Welcome Tinyverse goes straight to card_reveal.html after login + allowlist check (no profile form, no avatar picker, no WS.open() carousel). Island pulls use scripts/island-viewer-sequential-generator.js once, then save an immutable snapshot to the player's collection.

Archived (do NOT delete core code)

The legacy universe carousel and MMO picker live in engine/world/46-worlds-universe.js. Mark it archived: welcome Tinyverse no longer calls WS.open(), but the module stays loaded in tiny-world-builder.html. Dev, tests, and deep links may still invoke window.__tinyworldWorlds.open() / enterWorld().