Addresses the human review findings on the memory-pressure feature:
* [P2] Dismissal hid later incidents of the same kind. The gateway now
publishes `boot_id` (the lifecycle sentinel's started_at — changes on
every gateway life) in the /api/status memory block, and the dashboard
keys OOM-restart dismissal on it: acknowledging one restart no longer
mutes the NEXT one (the OOM-loop case this banner exists for). Live
pressure dismissals now also reset once pressure is demonstrably back
to "ok" — "unknown" (stale heartbeat) is absence of evidence and
clears nothing. Dismissal storage moved to a JSON list; old bare-string
entries fail JSON.parse and degrade to a clean reset.
* [P2] suspected_oom is a heuristic (unclean exit + low-memory final
heartbeat), not proof the OOM killer acted — banner copy now says
"restarted unexpectedly, most likely because it ran out of memory"
instead of stating OOM as fact.
* [P3] Mobile header clearance was applied per-banner (mt-14 on both
MemoryPressureBanner and ProfileScopeBanner) AND on the content
(pt-14), double/triple-stacking 56px gaps when banners were visible.
Replaced with a single h-14 spacer above the banner stack.
Shannon Sands
ba5dc00bb2