Development record

.abcd/development/brief/04-surfaces/19-identity.md:121-122 says the identity-positioning rule is gated on a committed registry. The gate tests presence on disk (internal/core/repolint/rule_positioning.go:42): with `.abcd/positioning.json` untracked, bare `abcd lint` still ran the rule and reported under it. .abcd/development/brief/04-surfaces/16-lint.md:162 states the presence gate correctly, and the comment at internal/core/repolint/rule_positioning.go:40 repeats the chapter's wording.