Aspire Project v2 migration

Migrate supported legacy .NET project resources to the experimental DotnetProjectResource model without silently changing application behavior. This skill first applies to AppHosts targeting Aspire 13.6 or newer.

Approval boundary: A request such as "migrate to Project v2" authorizes an assessment, not unseen edits. Present the exact per-resource and per-file plan, then obtain approval before changing AppHost, package, project-reference, or application files. Apply only explicitly approved subsets.

Hard gates