~anthropic/claude-sonnet-latest → B (8:2)

Side B implements a substantive, well-tested algorithmic improvement to pair selection (established-component merging, isolate attachment, rank-adjacency zipping) with several new unit tests validating the logic. Side A mostly removes an unrelated demo-counter feature and adds a settlement-worker/caching refactor, which is reasonable plumbing but is dwarfed by dead demo-code removal churn and lacks the depth of new behavior or test coverage seen in B.