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

Side B fixes a real functional gap: the old FetchEntity handler queued an async fetch and immediately morphed with (likely stale) data, giving no feedback when the fetch actually completed; the SSE-based fetch module now streams fetching→complete/error and morphs the actual result, which is a genuine architectural improvement with oneshot-based job result tracking. Side A is a well-tested but purely additive feature (reddit post thumbnails/images) that adds value but is lower-impact than fixing the fetch completion flow, though B does regress by removing a few existing reddit.rs unit tests without replacement.