V3 JavaScript/TypeScript test-run capability pack. By-value connector composition (service_kind=cli, no separate ingredient): one local jest CLI ingredient exposes bounded project operations for readiness and exact-path test execution. Test runs execute from an explicit project directory cwd supplied at execution time, accept one trusted exact test file path, return plain test output, avoid caller-supplied Jest flags, avoid shell wrappers, and keep test failures visible as text output. Fixed invocation, but approval-gated: Jest loads project config, environments, transforms, setup files, runners, serializers, and test code, so the run may execute arbitrary project Node code. The pack uses CI behavior, exact-path test selection, serial execution, cache disabled, colors disabled, no watch mode, no snapshot update, no caller-supplied config/root/project/reporter/output-file/coverage/watch/debug/changed/randomize/seed/test-name/environment/runner/transform/cache-clear/notification surface, no stdin, no environment override, and no arbitrary command execution. Requires jest on PATH.