ProcessDecoResults folds cell results into BuildId-matched region builds (MergeCellResult) and applies whole regions under the per-frame budget; there is no epoch guard on decoration results. Comment-only change. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01URDGLsu7c4nunqNFPJEFPU