31c982008b
Findings 05/STAB-3/4/5/8/12/16/17 + CONV-4 + onError (6 sub-batches, 29 tasks): Modbus desync teardown, AbCip runtime lock, FOCAS concurrent caches, new ConnectionBackoff + PollGroupEngine v2 (S7 poll fork deleted onto it, reconciled with R2-01), fleet connect throttles, ResolveHost via resolver, TwinCAT replay hardening. 29/29 tasks. S7 254/254 verified post-merge; build clean.