no discernable reason
One does not need to dramatically telegraph their motivations to their enemies for them to be legitimate.
Maybe this CMDR assumed you had or were manipulating the BGS in a way that was unfavorable to them. Maybe you once stole one of this CMDRs kills in a RES or nearly squished their ship and were recognized. Maybe the CMDR just wanted to test their packhounds and seeing a T-9 explode was the icing on the cake. All equally valid reasons for a player to have their CMDR attack that T-9.
I manage to low-wake escape 3 times before being destroyed as I am entering the airlock of a space station.
It was no fight, the only outcome was that my ship was going to be destroyed.
You had at least three chances to save your ship and you decided to stick around to be shot down.
It's possible that the individual was destroyed by the station, but I think they probably combat logged.
If the ship firing on you wasn't within 2km of the station when you actually exploded, it's highly likely they escaped.
The only positive from that was seeing packhounds in action.
Well, you learned that sometimes you need anti-missile defenses. It should also have become apparent that low-waking when you can be interdicted seconds later probably means you should leave the area rather than repeat an action that isn't working.