openai/gpt-chat-latest → A (3:2)

Commit A makes a broad architectural change to URL identity handling across the project. It introduces a dedicated URL canonicalization framework (`url_rules`), adds composable normalization rules, switches canonical IDs to full HTTPS URLs, updates parsing, parent/breadcrumb logic, projection application, Reddit mapping, state handling, and touches a large number of tests to migrate storage and behavior. This is a foundational change that affects core data identity and persistence semantics throughout the codebase. Commit B is also substantial: it fixes the external garden index, refactors the GitHub resolver into a new `resolvers` module, adds structured GitHub import cards with rendering support, updates UI and CSS, and includes integration tests. However, its impact is more feature-focused and localized compared with the repository-wide identity and canonicalization overhaul in A.