Development record

The brief at .abcd/development/brief/04-surfaces/08-abcd.md:413-417, .abcd/development/brief/04-surfaces/08-abcd.md:416 says: A name retired with no alias is answered with what replaced it, and never as a stale binary: ... `memory` and `source`, which merged into `library`. The shipped surface differs: `memory` is a registered, shipped top-level verb (`abcd memory --help`: 'Count the memory notes in both layers...'; listed under 'For agents and hosts' in `abcd --help --agent`; commands/memory.md exists; brief README row 37 marks `/abcd:memory` shipped). Only `source` is a retired name: `abcd source` prints the merged-into-library line, while `abcd memory` runs. The chapter lists a live verb as retired. (v0.14.2 release crosscheck, false-claim, raised by opus+sonnet in a07.)