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

Side A changes the durable storage schema (Deque -> List) with a real design rationale (avoiding a costly truncate-on-write, moving the cap to read-time), removes now-dead code paths, bumps schema version, and adds a targeted test validating the new capping behavior—this is substantive production logic. Side B is a pure test-suite refactor (deduplicating HTTP/OAuth helpers across bb test scripts) which improves maintainability but has no runtime/product impact.