Development record

The memory chapter gives exit 2 for a refusal by the gate (.abcd/development/brief/04-surfaces/37-memory.md:98), its gate section lists a degraded scanner and an unreadable private-names store among the refusals, and commands/memory.md:125 says every refusal exits 2. Both of those refuse the note, write nothing and exit 1, because only memnote.GateError and the named field and record errors map to 2 (internal/surface/cli/memory.go:143-147). A banlist match and a scanner span do exit 2.