0.11.1 — gate fixes from arm test 8

Two holes in the gate, both found by running the loop twice on 0.11.0 —
once on Haiku, once on Sonnet.

Fixed

• The Stop hook's block budget is per failure, not per session. A
  headless session keeps one session id across every /jig step, so a run
  that spent its three blocks on init, spec and make reached
  critique with none left: it reported "complete and approved, zero
  findings" having written no verdict files, and the gate that would have
  caught it had already let go. Fixing a failure now returns its attempts,
  a new failure starts fresh, and an agent that cannot fix a given failure
  still gets out after three tries.
• nav: horizontal bar (no menu) is no longer read as a menu button
  at a width where the links fit. A false positive is how a gate gets
  ignored.