Verified via real HTTP path (not just the direct SSH test done while
building it): correctly identified Home Assistant via SSDP, 400 on
malformed IP, 401 unauthenticated, clean empty result for a device
with nothing to find (Echo-type devices deliberately minimize their
LAN footprint -- expected, not a bug).
Fixed the same substring-matching mistake caught earlier in
device-labeling.spec.ts, this time on "known" being a substring of
"unknown" -- switched to matching .device-badge.known specifically.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
