Add Latent Split node (2/4 spatial split) for ComfyUI

Splits a [B,C,H,W] latent into left/right or top/bottom halves, or four
quadrants. Model-agnostic (SD, SDXL, Flux / FLUX.1 Krea); preserves batch
dimension and noise_mask.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,4 @@
+__pycache__/
+*.py[cod]
+*.egg-info/
+.DS_Store