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

B is a focused, self-contained algorithmic improvement to pair selection with clear rationale and new targeted tests validating the new tie-break logic, directly improving ranking quality. A is a large, sprawling URL-scheme refactor that collapses room routes from `/r/{short}/{slug}` to `/r/{short}{slug}` (arguably a regression in URL readability) plus unrelated YouTube normalization and hashing-contract tests, touching many files/tests for what is largely a cosmetic/format change with mixed value.