prisma-risk / tsoracle / 26350110025

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fix(proto): bundle LeaderHint epoch into a single nested EpochWire (#252) (#273)

The leader epoch travelled as two independent `optional uint64` halves
(`leader_epoch_hi`/`leader_epoch_lo`) governed only by a prose "both
present or both absent" rule. Nothing enforced it: a bug populating one
half yielded a corrupt epoch, and the client collapsed any partial pair
to `None`, silently skipping the monotone-forward `accept_hint` gate so
a stale or invalid redirect could be followed with no error.

Replace the two halves with a single `optional EpochWire { uint64 hi;
uint64 lo; }`. Presence now implies both halves, making a half-populated
epoch unrepresentable on the wire and in the generated Rust types. The
server builds `Option<EpochWire>` and the client reassembles via a single
`map` with no partial-pair branch.

Field number 2 is reused directly rather than reserved; this is a
breaking wire change, acceptable pre-1.0.

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