v0.32.7 — Simulators stay booted while their agent's job is queued

• Keep a simulator booted while an agent's queued job names it. The idle
  reaper shut a simulator down after 10 CPU-flat minutes unless a Maestro
  driver held it, so an agent whose xcodebuild -destination id=<UDID> (or
  name=<device>) was waiting in the queue lost its device and had to boot it
  again once admitted. Any live process under an agent session that names the
  device's UDID or exact destination name now holds it, including the waiting
  runner. This only ever retains a device; nothing new is shut down or killed.
• Termination reports now say whether memcap itself acted. memcap keeps a
  fixed-vocabulary record of its own process signals, queued-job cancellations,
  simulator shutdowns and watchdog environment stops (no pids, commands or
  paths), and every report includes memcap_*_30m counts. An
  unexpected-termination report states plainly when memcap did nothing in the
  30 minutes before it, so a failing test is not mistaken for a kill.