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

Side A is a focused, coherent refactor that centralizes path/URL logic into a well-tested types module, preserving behavior (tests moved and passing) while reducing duplication and improving type safety across the codebase. Side B delivers real feature value (room UI wiring, session cookies, web posting) but also includes an unrelated, unpolished 'plan2.md' architecture essay committed to the repo, which is noise/spectacle rather than working code, slightly diluting the commit's substance despite the legitimate routing/auth additions.