A little late, I was out of town.
Failing miserably is a great learning tool. If you haven't already, don't give up on this game yet. You may make many more devastating mistakes yet before you are annihilated. Might as well make your trial and error mistakes on one tainted game rather then playing through a brand new game only to make another debilitating mistake.
When playing I tend to fictionalize my mistakes and play on as though the mistakes were a normal part of the life of my simulated world: The failure of your craft to account for enemy ECM would be a "normal" military issue when (they) encounter a new and unknown foe. Until you would encounter such military technologies your scientists and military had never "known" about how could they have prepared for such an encounter? ....just playing along....
Don't worry, I haven't given up at all. In fact, I came back (after researching missile control that was vastly outranged to counter the ECM... yeah, gaming the system a bit but oh well...) and blew the ships to pieces before they were even in range to fire.
I then finally found what I assumed was their home system, and launched a full on assault, completely annihilating their fleet, and landing troops to take the planet.
It was only later I realized the "Wolfies" were actually Precursors.