Test-only: exercises the real ha_vote_self_freshness/handle_request_vote gate.
A heartbeat raise via ha_observe_heartbeat_committed lifts the floor to
max(durable=5, raised=9); candidate at 7 denied, at 9/12 granted; a lower
heartbeat never lowers it. Discriminating constants fail under either regression
(floor->durable-only or fold->min). No production/vote-path change (Req 3.2).
123/0.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
