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.