Very cool write up, thanks for sharing!
Some serious gray area here with the Unitist terrorism, and how brutal that the same people that made peaceful coexistence possible were also the self made arbiters of their own government's fate.
The idea of Catsbane is quite devious, but feels like a really natural progression of their protein research and the need for such measures. I imagine (as it's in the zeitgeist) Dandelionpaw having some sort of "I am become Death" moment a la Oppenheimer.
Question about the revolt: other than these high profile assassinations, what did this civil war look like? What did the felids & co deal with on the streets? What, other than the deaths of many leaders, caused the government to finally capitulate/fall?
You've put some real work in here, mad props!
The ultimate plot you mentioned near the end is really compelling, would be a great read/view (from previous posts, I understand you'd like an animation made from the material: I'd binge the hell out of it!). The Trophies cells are an interesting concept, are they still maintaining a certain level of lifestyle? Or are they becoming feral?
Also, concerning the civil war/revolution, this video (YouTube link) is an excellent watch for getting down to this brass tacks. Everything Hello Future Me does is pretty excellent, some great long-term Worldbuilding video essays.