Add custom nodes, Civitai loras (LFS), and vast.ai setup script

Includes 30 custom nodes committed directly, 7 Civitai-exclusive
loras stored via Git LFS, and a setup script that installs all
dependencies and downloads HuggingFace-hosted models on vast.ai.

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

custom_nodes/rgthree-comfy/py/context_merge.py

@@ -0,0 +1,37 @@
+"""The Context Switch (Big)."""
+from .constants import get_category, get_name
+from .context_utils import (ORIG_CTX_RETURN_TYPES, ORIG_CTX_RETURN_NAMES, merge_new_context,
+                            get_orig_context_return_tuple, is_context_empty)
+from .utils import FlexibleOptionalInputType
+
+
+class RgthreeContextMerge:
+  """The Context Merge node."""
+
+  NAME = get_name("Context Merge")
+  CATEGORY = get_category()
+
+  @classmethod
+  def INPUT_TYPES(cls):  # pylint: disable = invalid-name, missing-function-docstring
+    return {
+      "required": {},
+      "optional": FlexibleOptionalInputType("RGTHREE_CONTEXT"),
+    }
+
+  RETURN_TYPES = ORIG_CTX_RETURN_TYPES
+  RETURN_NAMES = ORIG_CTX_RETURN_NAMES
+  FUNCTION = "merge"
+
+  def get_return_tuple(self, ctx):
+    """Returns the context data. Separated so it can be overridden."""
+    return get_orig_context_return_tuple(ctx)
+
+  def merge(self, **kwargs):
+    """Merges any non-null passed contexts; later ones overriding earlier."""
+    ctxs = [
+      value for key, value in kwargs.items()
+      if key.startswith('ctx_') and not is_context_empty(value)
+    ]
+    ctx = merge_new_context(*ctxs)
+
+    return self.get_return_tuple(ctx)