[MEDIUM] GetPortOwner leaks Process handles on failed start diagnostics

[Daliys]

Problem

GetPortOwner creates a Process for lsof/netstat diagnostics and never disposes it.

Evidence

• Editor/MCPServer.Utils.cs:44 creates var p = new Process().
• macOS/Linux and Windows branches start/read/wait on the process.
• No using, Dispose, or Close is called.

Impact

Repeated failed server starts while a port is occupied leak Process wrappers and redirected stdout handles.

Suggested fix

Wrap the Process in using so handles are released after each owner lookup.

Source report

Imported from audit report item: resource-leak (9) / Editor/MCPServer.Utils.cs:44.