openai/gpt-5.2-chat → B (4:1)

Side B makes a substantive architectural change from a capped `Deque` to an append-only `List` with query-time capping, updating reducer logic, storage schema (schema version bump 3→4), write path (`push_front`→`push`), read path slicing, and adding a test to enforce the new cap semantics. Side A only adds CLI formatting and tests to display existing `ConnectivityStats`, which is useful but purely presentational and does not alter core behavior.