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Add @better-auth/ciba implementing OpenID Connect Client-Initiated Backchannel Authentication (CIBA) with poll and ping delivery modes. Uses the oauth-provider extension protocol to register the urn:openid:params:grant-type:ciba grant type and contribute backchannel_authentication_endpoint to AS metadata. Includes agent_claims forwarding, authorization_details propagation, and OAuth Client Attestation header passthrough to sendNotification.