Register a Cognitum Seed device. Creates a SeedClient connection, fetches identity, and assigns initial trust level. Default endpoint: — the Cognitum Seed link-local USB Ethernet address. Use this when no endpoint is supplied. Steps: 1. Resolve ENDPOINT: use the user-supplied value, or default to . 2. 3. If pairing token provided: 4. Show device status: Store registration event: ---