[Suicide Junkie]

An AI that recognizes you have sent it ships for a particular purpose and cares enough about your relationship to use them only for that purpose?
There isn't any AI in the world that does that.

Now, in SE4, if you gift some ships to an AI that you know is at war with your enemy, but allied with you, well naturally those ships are going to wind their way into fleets and towards the enemy. It helps to fly them to a gathering point and use the default design types so the AI knows to put them in its fleets.