CVE-2026-53816: OpenClaw: Paired nodes could forge exec lifecycle events without system.run provenance

OpenClaw nodes send lifecycle events back to the gateway. In affected releases, a paired node could send an exec lifecycle event that was accepted without enough provenance tying it to an authorized system.run request.

This issue affects the node event boundary. It does not allow an unauthenticated caller to reach the gateway; the attacker must already control a paired node connection.