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Add a payload envelope monitor that subscribes to the ExecutionPayloadAvailable SSE event (following the existing beacon_head_monitor pattern). The inclusion list service now races the IL deadline (66.67% into slot) against the payload envelope event, matching Lodestar's Promise.race approach. This ensures IL production fires as soon as the envelope is imported (when the EL has fresh state) rather than at a fixed offset that may be too early or too late.