SmartAttentionDispatcher — ComfyUI node that patches model attention with SageAttention

1. What is it and why A node that replaces PyTorch SDPA with SageAttention kernels (SA2 / SA3) without restarting ComfyUI and without launch flags. Automatically detects GPU architecture, installed libraries, and available kernels. Shows active mode, GPU tier, SA2/SA3 availability, and model architecture in the node status panel after each run. Inspired by Kijai's node, SmartAttentionDispatcher extends it with additional capabilities: specific kernel selection, dynamic combine mode, and for models that import attention locally (ErnieImage, Qwen, ACE-Step.