~anthropic/claude-sonnet-latest → B (8:2)

B is a coherent, compiling change that simplifies the room model (drops the unused/confusing ThreadVisibility field), threads that change consistently through events, reducer, RPC, CLI (adds `room create`), docs, and tests. A is a chaotic dump of speculative/idea files placed at repo root (not in server/src), several of which literally contain pasted shell prompts and `cat` commands baked into the file content, indicating they are not real, integrated source files but seed notes/junk with no demonstrated build integration.