prisma-risk / tsoracle / 26206552167
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feat(examples): openraft-standalone + openraft-piggyback (#20)

* feat(examples): replace openraft-cluster with openraft-standalone

Adopt the new tsoracle-driver-openraft crate. The example body shrinks
from a hand-rolled OpenraftDriver + file-backed store + leader_watch task
to three driver bindings plus a small StandaloneRouter wrapper that adds
host-specific NodeId -> tsoracle-addr resolution for LeaderHint
follower-redirect. tonic raft peer transport ports over verbatim.

SnapshotPolicy::Never is set because the bundled HighWaterStateMachine
keeps state in memory only; persisted snapshots are a planned crate
follow-up.

Operational story preserved: 3-process bring-up via scripts/run.sh,
`kill -9` leader for failover demo.

* feat(examples): add openraft-piggyback example

Single-binary, in-process 3-node demonstration of the envelope pattern:
a host service with AppData = HostCommand::{Kv(KvOp), Tso(HighWaterCmd)}
where TSO commands ride the host's existing raft log instead of a
dedicated TSO cluster. Uses openraft-toolkit's MemNetwork for in-process
transport; demo runs in ~3s.

The demo's run_demo() function is shared by the bin (src/main.rs) and a
smoke test (tests/smoke.rs) that asserts the post-failover monotonicity
invariant: new_high_water > old_high_water AND next_ts > last_pre_ts.

* fix(examples/piggyback): address review findings

- PiggybackHost::current_high_water now maps LinearizableReadError::
  ForwardToLeader to ConsensusError::NotLeader, mirroring StandaloneHost
  after PR #19. The example is a teaching artifact; the prior blanket
  TransientDriver mapping taught the wrong pattern.
- Demo binds tsoracle server ports via TcpListener::bind("127.0.0.1:0")
  rather than the hardcoded 55561/55562/55563 range, eliminating the
  CI conflict hazard.
- The two client.get_ts() retry loops now surface their transient errors
  via tracing::warn! during the retry window and include the underlying
  error in the deadline-expired anyhow! mess... (continued)

2404 of 2594 relevant lines covered (92.68%)

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Source Files on build 26206552167