The `page-header` paragraph already stated "the header asks for a sort,
it does not perform one"; actions now follow the same division and it
belongs beside it — the header decides what fits, the host decides what
happens.
Plan 018 moves to completed/ because #69 was the last thing it owed:
its size matrix promised "no action is ever unreachable at any
supported size" and the residual 114/162px clip was that promise
outstanding. Its recap also corrects a claim the plan made — the queue
and the actions were not the only two things competing for the header's
width, since every child of that flex row was flex-shrink: 0 and the
actions come last.
logan
3fa7c7734b