[http-client-csharp] Lazily resolve TypeProvider FQN in AddTypeToKeep to prevent stale namespace after visitor changes#10273

Draft

Copilot wants to merge 3 commits intomainfrom

copilot/fix-stale-fqn-storage

Commits on Apr 6, 2026

Initial plan
Copilot
authored
fix: store TypeProvider references in AddTypeToKeep for lazy FQN resolution

Copilot
and
haiyuazhang
authored
refactor: use HashSet<TypeProvider> to prevent duplicate type references

Copilot
and
haiyuazhang
authored