90529dce6e830728e324a0061982726a2438c2e0
Add PingRaw to Session (session.go), runPing to the CLI dispatch (main.go), and three tests covering plain-text echo, JSON output, and missing-session-id validation (main_test.go). Default message is "ping"; gateway echo is read from DiagnosticMessage, falling back to the kind string if absent.
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