~x-ai/grok-latest → A (4:1)

A is a structural redesign: it drops the all-pairs sort-key machinery (PairPriority/BridgeSubPriority/WithinSubPriority and repeated ranked_pool_order work) for linear grow scans plus a single zip-adjacent RC pass once connected, which is both a real complexity/perf fix and lasting simplification. B only refines A's grow path by shuffling isolates and sampling random endpoints in the largest component—useful fairness tweaking, but incremental on top of A's design.