A replay of a run: what the console held and what the bot's tick wrote, every emulated frame, with periodic keyframes and a tree of branches - so a window can pause, scrub anywhere already played, replay it, and start a fresh bot from any point without losing the future that was already there.
Design and the research behind it:
~/brains/personal/technology/artificial-intelligence/jev/replay-timeline.md.
Native only, like zbanks and mcp (packages/CLAUDE.md's exception
list): this crate writes files, which the wasm build cannot.