The handshake's third message must be PKI-encrypted, and licensed operation
neither sends nor decrypts PKI. A licensed node still opened a session,
raised the security-number prompt, and waited until it timed out.
A licensed node now refuses to start a session, from the admin message or
the screen, and tells the client why. It ignores a remote node's request
without a NAK, as a busy node does. The screen's node menu hides the Key
Verification entry in licensed mode.
Claude-Session: https://claude.ai/code/session_011DjtCrF8NLMGs9DtEVQkUK
Co-authored-by: Claude <noreply@anthropic.com>
