Rename project to ComfyUI-Tween

Update logger names, install prefixes, README clone instructions, and
error messages to reflect the new repo name. Model-specific node names
and categories (BIM-VFI, EMA-VFI, SGM-VFI) are unchanged.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

bim_vfi_arch/costvol.py

@@ -18,7 +18,7 @@ def _ensure_cupy():
             raise RuntimeError(
                 "cupy is required for BIM-VFI. Install it with:\n"
                 "  pip install cupy-cuda12x  (or cupy-cuda11x for CUDA 11)\n"
-                "Or run install.py from the Comfyui-BIM-VFI directory."
+                "Or run install.py from the ComfyUI-Tween directory."
             )