Third IP entry mode "auto": user supplies a starting IP, a range
(10.0.0.50-99), or comma-separated ranges; orchestrator walks the
candidates with `ping -c 1 -W 1` and grabs the first N that don't
respond. Skips the gateway and any IPs already assigned this run.
Confirms the picks via yes/no whiptail before locking them in.
Adds iputils-ping to ensure_dependencies.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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