Adjust parameters to address render issues.

Remove forced upcast (no longer needed).

Try a fixed fp16 VAE.

Explicitly enable upcasting, to confirm it is on.

Try explicitly disabling upcasting on the vae.

Restore VAE slicing (not supported by AutoencoderKL, so not a candidate for root-cause).

Disable VAE slicing. Flush GPU memory.

Revert "Try disabling FP16."

Try disabling FP16.

Move pipe to cuda call to ensure types are correctly modified.

Attempt to cast bias to f16.

Try disabling VAE slicing to see if that removes the CUDA incompatible half type.

Support device in pipe initialisers.

Update GPU identifying logic.

Select between cuda or mps based on environment.

Make experiments consistent & use shared utils.

Extract and refactor diamond crop img2img procedure.