prisma-risk / tsoracle / 26257419692

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refactor(client): drop expect() from flush-deadline path in driver_task (#64)

The flush-deadline branch computed its deadline via
`first_arrival.expect("set on enqueue")`. The invariant was upheld by
surrounding control flow, but the panic itself remained a runtime code
path and was brittle under future refactors.

Replace it with `if let Some(first) = first_arrival` so the driver falls
through to the empty-`chunk_queue` `continue` if the invariant is ever
broken, instead of panicking. The `#[expect(clippy::expect_used)]`
suppression goes away with the panic.

Add a focused tokio test that exercises the queue-non-empty +
flush_interval > 0 path under a paused clock: a lone waiter must be
dispatched after the flush deadline (no deadlock, no premature
dispatch), guarding the deadline-from-first-arrival semantic.

Closes #8.

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