fix(ssh): isolate managed tunnel processes - #4347

💭 Looking at the diff, I'm checking whether these changes violate any Effect service conventions. The modifications are straightforward—adding SSH control options to the tunnel command and corresponding test assertions—without any Effect service creation, refactoring, or consumption involved. I need to adjust the parameter format. I need to fix how I'm formatting the parameters. This change is just adding SSH command-line options to disable connection multiplexing, which doesn't involve any Effect service creation or refactoring. There are no convention violations here, so the result should be "All clear". Now I'm resolving the conflict between the instruction to output exactly "All clear" and the requirement for JSON schema—the JSON wrapper is the proper format, so I'll structure the response as JSON with a success state and the appropriate message.