V3 .NET CLI toolchain capability pack. By-value connector composition (service_kind=cli, no separate ingredient): one local dotnet CLI ingredient exposes bounded project operations for readiness, build checking, and test execution. Project operations run from an explicit project directory cwd supplied at execution time, disable implicit restore, suppress the logo, avoid caller-supplied dotnet/MSBuild/test-runner flags, avoid shell wrappers, and keep diagnostics visible as text output. Build and test operations are approval-gated because dotnet may compile project code, load SDK/MSBuild targets, run test adapters and test code, and write bin/obj/TestResults or other project-controlled artifacts. Requires dotnet on PATH.