Development record

`abcd land` runs the mention check only on a body it composes, and never reads the body of a pull request that already exists (`PRStateQuery`, `internal/core/landing/land.go`). So a body written by hand that names a record without a `Refs:` or `Resolves:` line fails the resolution gate within about a minute of the pull request opening, and a later land run names the `attribution` check as held without saying why. This happened on #1408 on 5 November.