Auth success alone does not prove the server can run commands (a server that
authenticates but rejects exec channels would be accepted, yet every fleet
operation runs commands). The probe now echoes a unique marker and requires it
in the output — proving exec works, while still tolerating servers that omit
the optional exit-status packet.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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