Add spatial batching to latent upscale

H3_LONG_VIDEOS_GUIDE.md

@@ -1163,6 +1163,7 @@ What this really means:
 - the sampled latent is upscaled in latent space to the target size
 - the conditioning is rebuilt at that target size
 - the node then runs a short refinement pass over the upscaled latent with the sampler, scheduler, step count, denoise, and megapixel target you picked on the latent-upscale params node
+- if the target is larger than the spatial tile size, that refinement pass is processed in spatial batches using the same tile defaults as the upstream latent-split node
 
 Good starting point:
 
@@ -1170,6 +1171,7 @@ Good starting point:
 - use the interpolation mode when you want a cheaper resize-only path
 - start with `euler_ancestral`, `simple`, `2` steps, and `0.2` denoise
 - leave width and height at `0` unless you want an exact override; otherwise `megapixels` drives the target size
+- leave the spatial tile inputs at their defaults first: `512x512` tiles, `64` overlap, `0` fade width, `earlier` overlap mode
 
 The important part is that this stage is still a latent pass, not a pixel-space resize: