A portable plugin can now declare `requires: {gpu: nvidia}` for an MCP
server. On a host without an NVIDIA GPU, Hermes then refuses the
install, hides the server's tools, and the catalog card says "needs an
NVIDIA GPU". The check is the existing
`hermes_platform.host.facts.gpu_class()` read.
The requirement is independent of `app:`. The RTX Remix Toolkit is the
first consumer: it is a package the user unpacks anywhere, so there is
no install location to check, but it needs an NVIDIA GPU.
An unreadable GPU (`unknown`) passes, so a failed registry or sysfs
read does not lock out a machine that has the GPU. Only `nvidia` is
accepted: gpu_class() reports the highest-priority vendor, which
answers the question exactly for NVIDIA and not for AMD or Intel.
A registered server on such a host reports the new `unsupported_gpu`
state, carried through the gateway contract and the Plugins tab, with
a sentence that names the GPU instead of "Install <app>".
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