Development record

The checklist chapter says each item carries the references it is about and an optional credential named by kind, scope and expiry (.abcd/development/brief/04-surfaces/40-checklist.md:35), and commands/checklist.md:77-78 says an item needing a credential names it that way. The schema validates and the list renders owner_refs and credential (internal/core/checklist/checklist.go:138-139), but `abcd checklist add` has only --next-look, --promise and --waits-on, `set` has only --state, and no non-test code assigns either field. Neither can reach an item through a shipped write.