Development record

`.abcd/development/brief/04-surfaces/37-session.md:234` lists the exit codes of the session verbs as 0, 1 and 2. `abcd session start`, `abcd session blueprint` and `abcd session setup` also exit 130 when the live brief session question is stopped with Ctrl-C at a terminal (`internal/surface/cli/session.go:224`, `:485`, `:730`; `internal/surface/cli/setup_interview.go:489`). The ahoy and reflect chapters name this exit for their own questions.