Changes touching this path

• an extra positional stops being dropped where a subcommand reads its arguments, because every leaf in the eight families now declares its arity beside its flags and check_sub refuses the token nobody expected by name, which caught a lane new t502 in the suite that had never carried its handle (#1419) 90472de4 · dbf3dbe6…

Renames are not followed. loot's tree maps a path to an address, so a rename is a delete and an add. This list is the history of the name, not of the bytes.