Complete Slice D3 by replacing the unbounded animation dictionary with a concurrent byte/count LRU and by putting the three retail alpha scratch owners behind one typed aggregate budget. Preserve immediate growth and draw order while reclaiming one-frame density spikes after sustained under-use. Close stale bounds-cache issue evidence without inventing a cache.
Define Slice D's transition and concurrency contract, add generation-safe asset handles and owner leases, and parse the existing cache ceilings through typed runtime budgets. Stale generations cannot release or revive replacements, and worker observations are bounded and coalesced.
Co-authored-by: Codex <noreply@openai.com>