Add warnings about 'exit' command in three locations to prevent AI from
disconnecting Telnet/SSH sessions during command execution:
- Prompt system rules (lab_automation_assistant_prompt.py)
- Display tool description (display_tools_nornir.py)
- Config tool description (config_tools_nornir.py)
The 'exit' command disconnects the session and causes all subsequent
commands in the batch to fail. This prevents users from viewing
command outputs properly.
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