Add PeerAuthMode to control peer registration:
- PeerAuthOpen: Allow all peers (backward compatible default)
- PeerAuthAllowlist: Only allow pre-registered peers or allowlisted public keys
New features:
- PeerRegistry.SetAuthMode/GetAuthMode for mode control
- PeerRegistry.AllowPublicKey/RevokePublicKey for key management
- PeerRegistry.IsPeerAllowed check before connection acceptance
- Transport rejects unauthorized peers with proper handshake rejection
New API endpoints:
- GET/PUT /peers/auth/mode - Get/set authentication mode
- GET/POST/DELETE /peers/auth/allowlist - Manage allowlisted keys
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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