An idea could be adding some "warscore" value once the war start, which is set at value 0 for both the parts (or the alliances) and progress toward positive or negative depending how many and which ship one of the side lose
Paradox generally does a good job of implementing this into their games. Warscore begins at 0 for each party and every 'victory' pushes the counter up by a value which reflects the significance of that victory. In Aurora, things like planetary occupation, civilian ship losses, and civilian population deaths could also affect the war score.
I disagree.
You will have to assign points to each ship but based on what? I mean probably the only real number here is the tonnage, however what about guns? Lose a defense platform of 100,000t with few lasers on it's not like losing 10 carries of 10,000t. Also my 10 1,000t FAC could struggle with a well balanced 10,000t cruiser well-armored and fully stocked or the other way round if I have done a good job designing my FACs.
Warscore might work well for AI vs AI so to speak. In a Human vs AI, it's always a mess. First of all too many spoilers: You know exactly how much your opponent has left in terms of resources and troops simply because it goes from 0 to 100% all of the sudden after a victory, meaning they out of guns. Second, until you hit the preset cap the AI refuses to deal with you (and this works both in case they winning or losing) which is a killer. From the player perspective if you can break the 25 points why stop at that? just get 50 and then 75 etc. You can calculate your odds the AI doesn't do that if you put a limitation on their expansion. AI is winning? Concede with a juicy pace deal at the right time and you just bought yourself a bit of time
This is also why Paradox was forced to add claims and other penalty buffers at some point. Do you see where I am going with this? Too complicated for a one-person development team.
Also, the beauty of Aurora is the unknown. You never know exactly what the race you just encountered has. What is their capability, how big is their empire, what tech, etc? As said add a spoiler such as Warscore will make all the intel gathering pointless.