- an unexported reserver (Reserve, Release) next to updater: the memory
store reserves under its mutex, the Redis store in one Lua script
(prune, SCARD, SET PX plus SADD); serveNew reserves instead of Count
then Put and releases on a failed connect or initialize (A-WR-03)
- serveNew, lookup's rehydration and the stateless getServer build the
SDK server with no router-wide lock held and insert or adopt under the
lock afterwards, so a slow guard or database check no longer stalls
the instance (A-WR-07)
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