~anthropic/claude-sonnet-latest → B (6:4)

Side B fixes a real user-facing bug (empty /-/ external index due to querying a bogus parent), adds a coherent resolvers/ module with a typed GithubImportCard schema and rendering, plus CSS/layout and integration tests validating the fix. Side A is a substantial architectural rework of URL canonicalization (composable url_rules engine) which is well-designed but is largely a refactor/rename churn (test-string updates dominate the diff) without fixing an observed bug, making B's concrete correctness fix and shippable feature slightly more valuable.