remake: a strict remake makes the registry, policy and bans anew

Review 2, N12: a strict remake kept only the values at the signed
places its manifest names, and copied what holds them as it was. A
member that replaced _continuum/users by a scalar before the turn left
the strict epoch without a registry, where any member may do anything.

The holders of the registry, `_continuum/access` and the bans are now
made anew as maps, with only what the manifest keeps copied into them;
and a manifest keeping no user is refused (at proposal, vote and build
alike), as a strict swarm without one would trust every member.

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