RootEventBus

Subscribe to raw wire channels and receive protocol events.

For assembled projections, use the lazy getters instead: thread.messages, thread.values, thread.toolCalls, thread.subgraphs, thread.subagents, thread.output.

Optional fast path for idle/stale threads: seed a scoped projection from checkpoint history instead of opening a replaying /events subscription. This produces a snapshot for finished-thread reconnects; active and interrupted threads return false so projections subscribe normally. Returns false when history cannot satisfy the projection and the caller should fall back to its normal subscription.