~anthropic/claude-sonnet-latest → B (75:25)

Side B delivers a substantial, load-bearing feature (GitHub OAuth login, session cookies, pseudonym claiming, trust-weight identity events, projection schema bump) plus a significant architectural cleanup (extracting durable to its own repo/dependency), backed by new unit tests, integration tests, and Playwright flows. Side A adds a useful but narrow RPC endpoint (RoomList) with good test coverage, but it's a much smaller, more isolated contribution compared to B's broad, foundational auth system and dependency restructuring.