Support Min Dependency Testing with Azure DevOps Feeds Issue

Issue:

Min dependency validation currently attempts to resolve packages from PyPI, even when an Azure DevOps feed is configured. This causes failures in network-isolated environments where access to PyPI is blocked.

Expected:

Min dependency resolution should work using Azure DevOps feeds only.
No fallback requests to PyPI when an explicit feed is configured.

Impact:

Min dependency tests fail under Network Isolation/CFS.
Prevents validation of packages in feed-only environments.

Ask: Investigate whether min dependency tooling can be configured to resolve exclusively from Azure DevOps feeds, or add support for feed-only operation.