The uv plugin reference does not explain the dependencies
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### What needs to get done
Craft Parts' documentation talks about the need for `uv-deps` or some other provisioning method for uv itself before building a part with it: https://canonical-craft-parts.readthedocs-hosted.com/latest/common/craft-parts/reference/plugins/uv_plugin/#dependencies
Snapcraft appears to drop this information entirely: https://canonical-craft-parts.readthedocs-hosted.com/latest/common/craft-parts/reference/plugins/uv_plugin/#dependencies
### Why it needs to get done
This information should be kept to avoid confusion, such as that in [this forum post](https://forum.snapcraft.io/t/uv-plugin-environment-validation-failed/48929)
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