~anthropic/claude-sonnet-latest → B (6:4)

Side B fixes a real logic bug (ghost items and mis-marked voted pairs from zero-ratio votes) with a small, precise reordering of a guard clause plus an updated unit test verifying the corrected invariant. Side A is a larger, more diffuse patch mixing a genuine parent-linking bugfix with unrelated signature churn (threading `tree` through multiple call sites) and integration test restructuring, making its net lasting value less clear-cut despite its size.