Adds <summary>, <param>, <typeparam>, and <inheritdoc/> tags to public
members surfaced by commentchecker — resolves 5,847 of 5,869 issues
(99.6%) across three /fixdocs passes.
Mirrors the publisher-injection pattern from FleetStatusBroadcaster and
PeerOpcUaProbeActor: Props accepts an optional Action<object> override so
tests can use a TestProbe sink instead of bootstrapping DistributedPubSub
(unreliable single-node in TestKit).
Un-skips the two RedundancyStateActor tests deferred under F6.
Joseph Doherty