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05b75abbca
Pin the three-domain rule (session = durable fact log, agent = live runtime surface, tools = registry/exec): a durable replayable fact is a SessionEvent; a live interception or transient/live-object signal is an agent/tools Cordis event. A boundary that is both is mirrored as an agent/* emit ONLY where a live consumer needs the Agent handle. Apply it to the boundary twins: drop agent/step-start and agent/step-end (no production consumer needs the live Agent at a step boundary — consumers read the durable step/start/step/end session events). Keep agent/turn-start/turn-end (the stdio UI labels output by agent.id). Tests that observed step boundaries via the removed emits now observe the durable session events; the pinned behavior is unchanged. Conservative subset of the proposed "remove boundary mirror events" simplification; foundation for the Hooks subsystem's canonical event surface.