Development record

The per-session checklist that autonomous sessions keep on disk (the draft intent "Every session keeps a checklist on disk", on branch chore/capture-agent-builder and not yet on main) must survive a crash: a session killed mid-write, a host or terminal restart, or a machine reboot must leave the last complete checklist readable and re-injected on the next start, never a truncated or half-written file and never an empty one. The design states this; nothing yet shows it holds. The product thinker requires a state-of-the-art pass and a lab before the claim is confirmed.