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* fix(server): create autonomous turns for spontaneous ACP session updates When an ACP-based provider handles background-agent completion notifications, the resulting spontaneous session/update messages have no active foreground turn to attach to. Mirror the Claude provider's autonomous-turn mechanism so these updates are recorded in Paseo's timeline. - Start an autonomous turn when a sessionUpdate arrives with no active foreground turn - Tag timeline events with the autonomous turn id - Complete the autonomous turn after a timeout, or before a new foreground turn starts * Fix ACP autonomous event scoping --------- Co-authored-by: zab <b13022010527@gmail.com> Co-authored-by: Mohamed Boudra <boudra.moha@gmail.com>