~x-ai/grok-latest → A (3:1)

A delivers a lasting core design change: tightens private-room HTTP paths to a single `/r/{short}{slug}` segment with shared `room_route` encode/decode, wires it through routers/nav/path builders/tests, and adds durable external-URL identity normalization (YouTube rewrite, query sort). B only adds a workspace-only offline CLI plus `server` helper module for local .sorter compile/JSONL lint—useful developer friction reduction, but non-runtime and easy to recreate relative to A’s product-facing URL contract.