Captures the deterministic command-replay design (seed + config hash + tick-tagged command log, re-simulated on playback), the command-chokepoint and timing model, determinism/checksum strategy, file format, and a sequenced Phase 0-4 implementation plan. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DUsFgd2Ga6pmLz8giS8WUn