Development record

The hook row at .abcd/development/brief/04-surfaces/README.md:280 cites 26-mode.md as the home of `stop` and `stop-failure`. That chapter names neither event, the stop check nor API errors. What `abcd hook stop --help` states (a turn's end blocked while work is owed and naming the next item, allowed only with a session cron firing in time, a last message ending on a question blocked once, the host's cap on consecutive continuations) is described nowhere in the brief; 02-constraints/03-invariants.md:165-177 covers only the check's forge read, and 01-ahoy.md:840 only how its shim resolves.