Development record

The memory chapter gives exit 1 for 'a machine file the read refuses' with no scoping to a sub-verb (.abcd/development/brief/04-surfaces/37-memory.md:97), and commands/memory.md:125-126 repeats it. Only `memory add` and `memory remove` exit 1 on such a file. Bare `abcd memory` and `abcd memory list` exit 0, name the file as unreadable and report no notes from it.