~x-ai/grok-latest → A (4:1)

Side A introduces a real architectural win: vendoring a RocksDB-backed durable crate, moving Reddit entity JSON off the in-memory GlobalTree into entity_db, and streaming events.jsonl line-by-line so startup no longer loads the full log. Side B is a necessary but narrow correctness fix—dropping shared WEB_BROWSER_AGENT/INVITE sentinels so multi-user browser votes no longer collide on AgentBound—without comparable lasting systems impact.