b2584e6705
All signaling event types in group calls (answer, hangup, reject, renegotiate) now include p-tags for every group member, matching the pattern already used by CallOfferEvent. This allows signing the inner event once and gift-wrapping it separately for each recipient. - Add Set<HexKey> build() overloads to CallAnswerEvent, CallHangupEvent, CallRejectEvent, and CallRenegotiateEvent - Add createGroupCallAnswer, createGroupRenegotiate factory methods - Fix createGroupHangup to sign once instead of per-peer - Update createGroupReject to accept full member set - Update CallManager to use group methods when in group call - Document group call p-tag convention in NIP-AC spec - Add tests for all group build overloads https://claude.ai/code/session_013h2E7spwHDgSjunqumsYgp