Method persistStateSnapshot

backend/session.go:272–282

(state *agent.AgentState)

		state := c.state
		c.stateMu.Unlock()
		c.emitStatus("running", nil)
		c.ui.RunSubmitMessage(runCtx, input, state, c.id)
		if c.engine.CoreEngine != nil {
			c.stateMu.Lock()
			c.state = c.engine.CoreEngine.LastState
			c.stateMu.Unlock()
		}
		_ = c.Save()
		c.emitStatus("idle", nil)
		c.bridge.emitEvent("session.done", c.Snapshot())
	}()
	return nil
}