prisma-risk / tsoracle / 26346772476

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feat: populate NOT_LEADER hints with leader endpoint and epoch (#88, #125) (#234)

* feat(consensus)!: carry leader_epoch on LeaderState::Follower

The openraft driver now derives the follower epoch from the raft term;
paxos emits None. Server propagation and wire emission follow.

* feat(driver-openraft): resolve follower leader_endpoint from a peer map

Adds OpenraftDriver::with_peers / from_arc_with_peers keyed by the
driver's NodeId; map_leader_state resolves the elected leader's tsoracle
endpoint. OpenraftDriver::new stays as the empty-map (no resolution) case.

* refactor(examples): drop StandaloneRouter; use OpenraftDriver::with_peers

Endpoint resolution now lives in the driver, so the standalone example no
longer hand-rolls leadership_events().

* feat(server)!: carry leader_epoch through ServingState::NotServing

run_leader_watch propagates the follower epoch from the consensus
LeaderState::Follower event into the published serving state.

* feat(server): populate LeaderHint.leader_epoch in NOT_LEADER paths

Both service-layer hint builders split the ServingState leader epoch onto
the wire halves via a shared wire_epoch helper, completing the server side
of the stale-hint protection contract.

* test(client): higher-epoch leader hint wins regardless of arrival order

* docs: describe leader_epoch on follower hints and drop StandaloneRouter refs

* docs(client): correct leader-epoch comments now that openraft servers populate it

186 of 187 new or added lines in 8 files covered. (99.47%)

10358 of 10924 relevant lines covered (94.82%)

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