~x-ai/grok-latest → B (2:5)

B adds load-bearing runtime and ops pieces (JSONL EventLog append/load, ViewStore persistence, Dockerfile/fly.toml, kaocha deps.edn) that the project actually runs on. A mostly drops a disposable plan.md plus a thin RouteContext newtype that delegates to existing ThreadNav, so little permanent behavior lands beyond scaffolding for a future refactor.