Owns typed public optimization contracts, the complete embedded text-space optimization loop, prompt resources, exact patch application, held-out gates, and split reporting. Uses caller-supplied Microsoft IChatClient and IEvaluator. Keep pure helpers separate from orchestration. Verify with dotnet build ../../ManagedCode.SkillOpt.sln --configuration Release and dotnet test ../../ManagedCode.SkillOpt.sln --configuration Release.