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Give a keyless agent parity with a local one for the ephemeral signals a running agent emits so an owner and channel can see it work. presence.set and typing.set were named as deferred by #6742; observer.emit and liveness.ping are net-new -- the trajectory and keepalive planes the contract never enumerated but a keyless agent needs just as much once it holds no relay connection. Four best-effort actions, all following the existing contract shape (strict wire, one spelling of every identity, no member names its own subject): - presence.set -> status only (reuses buzz_core PresenceStatus) - typing.set -> channelId only; ephemeral, no stop counterpart - observer.emit -> a batch of frames, each { kind, payload }; payload is opaque and encrypted host-side, and the outcome is a batch receipt since re-batched frames have no stable per-frame id - liveness.ping -> { channelId, turnId }; distinct from an observer frame so a host can attach meaning (reset a stall watchdog), not just forward it The host still derives owner, key, encryption, and all Nostr metadata; the agent supplies only content. observer.emit and liveness.ping overlap on the wire -- flagged in the module docs so a reviewer can collapse liveness.ping if preferred. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Signed-off-by: Joel Robotham <jrobotham@squareup.com>