ben-manes / caffeine / #5574

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Bound per-cycle expiration to amortize idle-recovery spikes

Cap expireAfterAccessEntries/expireAfterWriteEntries and the variable
TimerWheel.advance at EXPIRATION_THRESHOLD evictions per maintenance
cycle, then re-arm via PROCESSING_TO_REQUIRED so the backlog drains
across cycles. Mirrors drainWriteBuffer's cap; keeps a large expired
population from stalling a writer-assist under evictionLock. The wheel
rewinds nanos and re-links the unprocessed bucket remainder to resume.
The validation subject pumps cleanUp until IDLE to drain the re-arm.

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