v0.0.43: FC-P3-T4 — voice calls via WZP audio bridge

Web client:
- After call goes "active", connects to WZP web bridge WS
- Mic capture: getUserMedia → ScriptProcessor → PCM int16 frames → WS
- Playback: WS → PCM int16 → Float32 → AudioContext.createBufferSource
- Room name derived from peer fingerprint (deterministic)
- Relay address fetched from /v1/wzp/relay-config
- Audio auto-starts on accept/answer, auto-stops on hangup/reject
- startAudio()/stopAudio() manage full lifecycle

TUI:
- /call shows "Audio: use web client for voice (TUI audio coming soon)"
- Signaling works, audio requires web client for now

This completes the last critical task — voice calls work end-to-end:
  User A calls → signaling via featherChat WS → User B accepts →
  both connect to WZP relay → audio flows

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

warzone/crates/warzone-client/src/tui/commands.rs

@@ -571,6 +571,7 @@ impl App {
                         .map(|s| if s.len() > 16 { format!("{}...", &s[..16]) } else { s.to_string() })
                         .unwrap_or_default();
                     self.add_message(ChatLine { sender: "system".into(), text: format!("📞 Calling {}...", display), is_system: true, is_self: false, message_id: None, sender_fp: None, timestamp: Local::now() });
+                    self.add_message(ChatLine { sender: "system".into(), text: "Audio: use web client for voice (TUI audio coming soon)".into(), is_system: true, is_self: false, message_id: None, sender_fp: None, timestamp: Local::now() });
                     self.call_state = Some(super::types::CallInfo {
                         peer_fp: peer_fp_clean.clone(),
                         peer_display: display.clone(),