I think Eru would have been aware of what Saruman would do - but that He didn't plan it. In Middle-earth there is free will but there are also consequences of free will. Saruman chose freely his road & brought his doom on himself. Eru knew everything that would happen - including when & how He would intervene personally, but to control everything all the time would have made the creation pointless - why not simply sit there in eternity & daydream?
Eru creates because it is His nature to create - He creates free creatures because that is the height of the Creator's art. for Him to have planned Saruman's treason means that he also planned his fate - which would either make Saruman little more than a robot, or worse, a victim, forced against his will to act in a way that was against his nature with no means to avoid the consequences.
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