Development record

`.abcd/development/brief/04-surfaces/03-embark.md:135-136` says embark writes the record families plus the marker block. An embark that writes an issue also leaves `.abcd/work/issues/.iss-alloc.lock` in the target, from the ledger lock taken at `internal/core/lifeboat/embark.go:157`. `.abcd/development/brief/04-surfaces/03-embark.md:121` names the lock but not the file, and in a fresh target the file shows as untracked, so a plain `git add` of the result commits it.