Native calls: upgrade to LiveKit 2.15 + add CallKit audio-session coordination

Root cause of the intermittent dead-mic / no-audio / late-speaker: LiveKit's
automatic AVAudioSession config races CallKit's activation. The fix needs the
2.15+ audio API, which the build wasn't getting ('~> 2.0' resolved an older 2.x
from a stale spec cache). So:
- NativeCall.podspec: pin LiveKitClient '~> 2.15'.
- codemagic.yaml: 'pod install --repo-update' so the spec repo knows 2.15.x.
- Plugin: disable LiveKit auto audio-session config + keep the engine OFF; in
  CXProvider didActivate set the session category and enable the engine; in
  didDeactivate disable it. Request mic permission on connect so enabling the
  engine in didActivate doesn't block on undetermined permission.

All AudioManager APIs verified against the raw 2.15.3 source (setEngineAvailability,
AudioEngineAvailability.default/.none, audioSession.isAutomaticConfigurationEnabled).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

mobile/plugins/native-call/ios/Sources/NativeCallPlugin/NativeCallPlugin.swift

@@ -54,16 +54,21 @@ public class NativeCallPlugin: CAPPlugin, CAPBridgedPlugin, PKPushRegistryDelega
         registry.delegate = self
         registry.desiredPushTypes = [.voIP]
         pushRegistry = registry
-        // NOTE: the CallKit↔LiveKit audio-session coordination (AudioManager.audioSession /
-        // setEngineAvailability) needs LiveKit 2.15+, but the build currently resolves an older 2.x that lacks
-        // those symbols. So we rely on LiveKit's default audio handling for now and only configure the session
-        // with plain AVFoundation in didActivate. Revisit once the pod is pinned/upgraded to 2.15+.
+        // CallKit audio coordination (needs LiveKit 2.15+, pinned in NativeCall.podspec). LiveKit's automatic
+        // AVAudioSession configuration RACES CallKit's own activation → intermittent dead mic / no audio + the
+        // output route only settling once audio flows ("speaker turns on late"). Fix: turn auto-config OFF and
+        // keep the audio engine OFF; we configure the session and enable the engine ONLY in didActivate.
+        AudioManager.shared.audioSession.isAutomaticConfigurationEnabled = false
+        try? AudioManager.shared.setEngineAvailability(.none)
     }
 
     // MARK: - LiveKit media
 
     private func connectRoom(url: String, token: String) {
         guard !url.isEmpty, !token.isEmpty else { return }
+        // Ask for mic permission now (we still connect MUTED). If it stays "undetermined", enabling the audio
+        // engine in didActivate can block on first use — determining it up front avoids that.
+        AVAudioSession.sharedInstance().requestRecordPermission { _ in }
         let old = room
         let r = Room()
         room = r
@@ -285,12 +290,20 @@ public class NativeCallPlugin: CAPPlugin, CAPBridgedPlugin, PKPushRegistryDelega
         action.fulfill()
     }
 
-    // Keep the last known-good audio behavior (rely on LiveKit's default session handling). We only report the
-    // state to JS. The proper CallKit↔LiveKit session coordination is deferred until the pod is on 2.15+.
+    // CallKit owns the AVAudioSession lifecycle. Since LiveKit auto-config is OFF, configure the session HERE —
+    // when CallKit activates it — and enable LiveKit's audio engine. This is the fix for the intermittent
+    // dead mic / no-audio and late speaker routing. Don't call setActive(true): CallKit already activated it.
     public func provider(_ provider: CXProvider, didActivate audioSession: AVAudioSession) {
-        notifyListeners("audioActivated", data: ["ok": true])
+        do {
+            try audioSession.setCategory(.playAndRecord, mode: .voiceChat, options: [.mixWithOthers])
+            try AudioManager.shared.setEngineAvailability(.default)
+            notifyListeners("audioActivated", data: ["ok": true])
+        } catch {
+            notifyListeners("audioActivated", data: ["ok": false, "error": String(describing: error)])
+        }
     }
     public func provider(_ provider: CXProvider, didDeactivate audioSession: AVAudioSession) {
+        try? AudioManager.shared.setEngineAvailability(.none) // keep the engine off until the next call activates
         notifyListeners("audioDeactivated", data: ["ok": true])
     }
 }