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Folded into the existing on-demand Deep check button: queries Fingerbank's interrogate API with the device's MAC plus the SSDP SERVER header when deep-check-device.sh finds one, showing the confidence band alongside the result. Runs directly from the API container (no host-level access needed, just an outbound HTTPS call), unlike the SSDP/mDNS steps. Confirmed via direct testing: without DHCP fingerprint data (which we structurally don't have, not being the DHCP server), MAC-only queries often can't get past manufacturer-level confidence -- same info the free OUI lookup already provides. Documented honestly in docs/device-discovery.md rather than overselling it. Still worth having as opt-in enrichment for devices that do expose richer signals. Gated behind optional FINGERBANK_API_KEY -- missing key, API errors, or no match all degrade gracefully without affecting the rest of deep-check's local findings. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>