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

Side A removes an entire legacy projection code path (dead GitDiscovery-based rendering), simplifies epoch/commit pages to a single Evidence-only contract, and rewrites tests to match the new schema — a clear architectural simplification reducing future maintenance burden. Side B is a useful but more incremental UI fix (vote-count badges, unpin-via-POST instead of link) bundled with theme CSS tweaks and a browser test, valuable but narrower in scope than A's structural cleanup.