The state memberships held the part's wrapper ({node, module, digest, membership, published, retired}) while every
reader takes the bare membership the assignments stream carries: novox's tool runner decoded an empty one and served
no tool. The part now writes membership.EncodeGrantsMembership of a membership published or unchanged, never one held
back. The pass record moves to the pass the part already keeps (user-list at pass): published or why not was there, the
retired seat verbs are added as Result.Retired; grants_membership reads both, so no new state is declared.
Issue 774 (the bus login list, L3). Quick fix: marshal m.Membership here. Thorough, chosen: one codec in mesh-sdk the
writer and the tool runner share, because a hand-built fixture agreed with the mistake. Pins mesh-sdk at the head of
its fix/memberships-shape.