[Feature] A way to exceptionally open a window as floating

Is your feature request related to a problem? Please describe.

Basically, I am making a GLFW + WebGPU (Vulkan) based native application, which's window is resizable. It turns out that Karousel will capture it (of course it will), and when I make it floating, the window won't be the size I initially told it to open in.

Describe the solution you'd like

Basically a way - maybe an environment variable, maybe a wrapper app - to tell Karousel "This app should open in floating mode"

Describe alternatives you've considered

I could make the window non-resizable, but I don't want to.
I could add the specific app I'm making to the Karousel rules, but then I'd need to make more rules for future apps I'd be making.
I guess the most sensible thing to do would be to make a dummy command that executes the app exactly as is, but has a Karousel rule to always be floating. But what I'm asking here is that such a solution could be directly part of Karousel itself

No files or tests are named. Start by tracing Karousel's existing rules and floating-window handling, then define how an application can request an exception and verify that resizable windows open floating without per-app rules.