openai/gpt-chat-latest → A (4:3)

Side A introduces a substantive URL canonicalization architecture by extracting normalization into composable `url_rules` modules, making `ItemId` consistently use canonical HTTPS URLs, fixing parent/breadcrumb handling, and updating projection/event parsing to canonicalize stored IDs. Side B adds valuable deployment infrastructure, a live audit dashboard, SSE progress reporting, and CI/CD, but those are primarily operational features rather than core data-model improvements; the canonical identity changes in A have broader long-term impact on correctness and consistency.