A custom node's compiled packages are built for the card that runs them

Stable Fast 3D's texture_baker and uv_unwrapper are C++/CUDA packages no
index has; on the PoC they were built and installed into ComfyUI's
environment by hand. nodes[].build names such directories, and the gate
builds each as a wheel with ComfyUI's Python, for the compute capability
torch reports for the replica's own card, keeps it on the node by the
node's commit, the architecture and the directory, and installs it
beside the replica with the node's requirements. A copy in ComfyUI's
environment does not pin it. A node with no CUDA toolkit says so.

comfyui.huggingface_repo shows the replica's weights to a node that
loads them by repository name, in the engines' Hugging Face cache, so a
gated repository needs no token on the node.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

docs/reference.md

@@ -67,6 +67,7 @@ rather than repeated.
 | `output` | `string` | [ComfyUI](#comfyui) |
 | `inputs` | `[]Input` | [ComfyUI](#comfyui) |
 | `nodes` | `[]CustomNode` | [ComfyUI](#comfyui) |
+| `huggingface_repo` | `string` | [ComfyUI](#comfyui) |
 | `environment` | `string` | [ComfyUI](#comfyui) |
 | `dir` | `string` | [ComfyUIConfig](#comfyuiconfig) |
 | `python` | `string` | [ComfyUIConfig](#comfyuiconfig) |
@@ -84,6 +85,7 @@ rather than repeated.
 | `repo` | `string` | [CustomNode](#customnode) |
 | `commit` | `string` | [CustomNode](#customnode) |
 | `requirements` | `[]string` | [CustomNode](#customnode) |
+| `build` | `[]string` | [CustomNode](#customnode) |
 | `id` | `string` | [Endpoint](#endpoint) |
 | `url` | `string` | [Endpoint](#endpoint) |
 | `api_key` | `string` | [Endpoint](#endpoint) |
@@ -824,6 +826,16 @@ Inputs are what the workflow takes from a request at
 Nodes are custom nodes the workflow needs, put in each replica's own
 custom_nodes at the commit named.
 
+### `huggingface_repo`
+
+`string`
+
+HuggingFaceRepo is the repository a custom node loads the weights by
+name from (Stable Fast 3D's loader asks for stabilityai/stable-fast-3d):
+the replica's weights are shown to the node there, in the Hugging Face
+cache of the engines' user, so nothing is fetched and no token is
+needed when it runs.
+
 ### `environment`
 
 `string`
@@ -958,6 +970,17 @@ ComfyUI's environment: a package named here at the range named, and
 every other one at the version ComfyUI already runs. One named here
 is first on ComfyUI's path, so its range must suit ComfyUI too.
 
+### `build`
+
+`[]string`
+
+Build are directories of the repository that are Python packages to
+be compiled rather than downloaded: C++ and CUDA extensions no index
+has (Stable Fast 3D's texture_baker and uv_unwrapper). Each is built
+as a wheel with ComfyUI's Python for the card the replica runs on,
+kept on the node for the next replica on the same kind of card, and
+installed beside the replica like its requirements.
+
 ## Endpoint
 
 ### `id`