openai/gpt-chat-latest → A (5:1)

Side A introduces substantial new infrastructure: a RocksDB-backed `durable` workspace crate, an `EntityStore` that moves raw Reddit JSON off-heap, and a streaming `EventLog::replay` API that replays one line at a time to reduce startup memory, with corresponding integration into state loading and reducers. Side B mainly refactors URL canonicalization by introducing `url_rules`, switching to canonical `https://` identifiers, and updating parsing/tests, which is useful but narrower in long-term architectural impact than the persistence and replay redesign in Side A.