Development record

.abcd/development/brief/04-surfaces/27-implement.md:265-266 says that without its wait flag the check exits 0 on every status and never refuses. That holds for statuses, but `abcd implement load` with no flag exits 2, naming --site's values preflight and eval-harness. The chapter mentions `--site` at lines 139 and 163 and in its appendix at line 720, without saying it is needed or what it takes; commands/implement.md:915 gives both.