Optional ReadonlycontinuationsGeneration checkpoints, written every everyTokens generated tokens.
Optional ReadonlyprefixesReusable prefixes, tiered over saved state when there is any. Null: the service reuses nothing and keeps nothing.
Optional ReadonlysavedSaved state the prefixes tier over; reported, never reached by callers.
The parts a service composes.
createKvCacheServicebuilds them from the serve flags; CPU tests and replacement runtimes may supply their own.