op-reth: flush buffered proof tail on shutdown - #22090
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Closes #22089.
Engine::runpreviously waited only for an already in-flight proof-history persistence job when its action channel disconnected. If fewer blocks than the persistence threshold remained buffered, a clean shutdown dropped that tail even though the ExEx had already emittedFinishedHeightfor it. On restart, the ExEx WAL did not replay those blocks and the persisted proof window stayed permanently behind the execution tip.This change drains any existing save, schedules the remaining memory buffer and waits for that final save before the collector thread exits. The regression test covers a one-block tail below the normal five-block threshold and verifies that it reaches persistent storage.