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

Commit B is a substantial architectural migration (REST endpoints to a unified RPC batch API, introducing room-scoped state, rewriting reducer/thread indexing, CLI restructuring, and updating extensive integration/grant tests) that changes the project's core API surface and permission model. Commit A is a well-scoped, tested algorithmic refinement to pair-selection heuristics in one file, valuable but far narrower in scope and impact than B's system-wide restructuring.