Two bugs caused accessories to render independently of their NPC:
1. spawnEntities ran concurrently with state updates, allowing duplicate
sprites to be created for the same entity. The orphaned sprite would
animate in place but never move. Fixed by deferring onStateUpdate
registration until initial spawn completes.
2. CharacterCompositor tracked load intent (Set) rather than load
completion (Promise), so concurrent preloads could composite before
shared textures finished loading — producing sprites with missing
skin layers. Fixed by using a Map<string, Promise> so concurrent
callers await the same per-file load promise.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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