Add initial Python package support for NetBox, including wheel and sdist
builds, generated package metadata, and Test PyPI publishing for maintainer
validation.
Add package-aware CLI support, `netbox setup` scaffolding for instance-local
files, and centralized wheel-vs-checkout path handling while preserving the
existing source/archive install layout.
Bundle pre-rendered embedded documentation in the wheel, and extend CI to
verify dependency pins, wheel metadata, artifact contents, CLI behavior, sdist
rebuilds, and smoke-test upgrades.
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