docs: federation: the answers to its open questions

What the maintainer answered to the design's open questions, in the
design:

* The numbers. The limits and the times are the policy's numbers, set
  in the genesis policy and changed by a decision: 64 keys, 64 nodes
  and 256 addresses a user for a start; `window`, `absent`, `gone`,
  `archiveRetention`. A lowered limit takes nothing away.
* A user nobody vouches for is out, and its names wait for it: nobody
  else claims them. Out for 30 days, as the stamps of a third of the
  voters show, it is gone: its names are free, and no vouch brings it
  back. So whoever relied on a vouch that an unvouch or a cut took
  back has that long to find another, and loses nothing meanwhile.
* First keys by a decision. The voters are above every user's first
  keys: they give a user that lost them new ones, with a cut for the
  old. The promises say so, and what isn't promised: a name against
  two thirds of the voters.
* What a decision is made of (a proposal, a vote, its release, the
  decision) is taken in any node's change, so a user without a node
  votes at whatever node it reaches, or by a vote carried to one. Such
  a user names another party's node to carry for it.
* Coming back after remakes: by the archives on nobody's word, epoch
  by epoch, as far as peers keep them; else by an ID the operator
  gives, never because peers advertise an epoch. A statement is
  carried over from the epoch before only; older ones are quarantined
  for the user to sign again.
* Resolving reads the decisions first: nothing below changes them.
* The questions that remain are put with their options: who has a
  vote and from when, whether the voters put a user out against those
  who vouch for it, from where an unvouch undoes, whether gone is for
  good, the price of first keys by a decision, and what the root
  holds unsigned.

The attacks are 76; the stages name them by their numbers.

future-work.md: barring a user by a decision, and voting made easy for
a user without a node.

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