prisma-risk / tsoracle / 26479209265

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fix(client): enforce per_attempt_deadline on get_current_max_safe (#525)

Mirror the `attempt` path: share one `PairBudget` across `client_with_cell`
and the RPC, time both phases out at `RetryPolicy::per_attempt_deadline`,
and evict the cached channel on a transport-class failure (incl.
`DeadlineExceeded`). A black-holed endpoint or a user-supplied
`channel_connector` whose future never resolves could previously hang
a coordinator/poller indefinitely; the public API now honors the same
deadline contract as `get_ts`. Single-shot semantics are preserved —
followers return `0` rather than `NOT_LEADER`, so there is no leader-
hint to chase and no worklist to drain.

Regression test drives the exact attack shape (hanging connector +
100 ms `per_attempt_deadline`) through the public surface; an outer
5 s safety timeout converts a hang on regressed code into a clean
diagnostic panic instead of a runaway test runner.

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