openai/gpt-chat-latest → B (5:1)

Side B introduces a substantial URL canonicalization architecture by extracting normalization into a new `url_rules` module, converting `ItemId` to canonical HTTPS URLs, updating parsing, parent/breadcrumb logic, projection application, and Reddit mapping, with broad test coverage. Side A is a useful targeted bug fix that skips stickied/pinned Reddit posts during subreddit import and adds a regression test, but its impact is much narrower than the lasting infrastructure and consistency improvements in Side B.