validate-family.py: a member's checkout, a shape copy, the shape pin or family.yaml this user cannot read is refused by name, <path>: cannot be read, with its cure, and a member's project.yaml is member-manifest-unreadable, so no Python 3.12 traceback and no 3.14 member-uninitialized, pinned but absent, does not exist or update of a checkout that is there (#430) - #956