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

B wires up substantial, necessary functionality: cookie-based session auth for browser login/logout, private room routing/permissions, and a reusable ThreadNav abstraction spanning public/room threads, which is a meaningful architectural extension to the app's core navigation and auth model. A is a cleaner, well-tested, but narrower feature (Reddit post image/link rendering) with a nice new render module and unit test. B's inclusion of the irrelevant, AI-transcript-like plan2.md is pure noise and a blemish, but the actual code changes in B still cover more load-bearing surface area than A's isolated enhancement.