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

Side A ships a complete, tested feature (pairwise vote-compare page with a principled next-pair/bridge-selection algorithm in pair.rs), fixes a real correctness bug in ItemId normalization (from_storage) that ripples through reducer/reddit import, and improves test infra (extracted mock-reddit support, new Clojure e2e test) — all backed by unit and integration tests. Side B mainly stands up generic plumbing (form_template holes, ui_action enum, /ui route) for existing forum actions, which is useful scaffolding but smaller in scope and lower-stakes than A's working feature plus bugfix.