feat: media player with reconciliation and pinned media proxy (Phase 5)

- MediaAPI client for all 10 media endpoints + Codable models
- PinnedMediaResourceLoader: AVAssetResourceLoaderDelegate proxying
  https media through the pinned-TLS session (AVPlayer ignores registered
  URLProtocol subclasses and can't trust the self-signed cert)
- MediaPlayerController: AVPlayer + 1.5s poll reconciliation ported from
  web app.js (track swap, late audio_url, desired state, seek_hint,
  reporting, enter-media-scope carry-over, post-talk resume)
- MediaPanelView UI + music.note toolbar entry
- VoiceSession wiring (enterMediaScope/endConversation)

Playback of the library's webm tracks is blocked by an iOS platform
limitation (AVPlayer cannot decode webm); TLS/Range proxy, reconciliation,
polling, reporting and UI are all verified working in the simulator.

Voice.xcodeproj/project.pbxproj

@@ -14,15 +14,19 @@
 		3E01A0AF44FD3324FA72C43C /* OrbView.swift in Sources */ = {isa = PBXBuildFile; fileRef = A62BAE22E3A165DCB5DFFEE1 /* OrbView.swift */; };
 		64291BBC8D0DAD47E07E94E0 /* ConversationState.swift in Sources */ = {isa = PBXBuildFile; fileRef = A0C23305A6C55A83F8617D9D /* ConversationState.swift */; };
 		720C26EC163AE46713B02DD8 /* TLSPinning.swift in Sources */ = {isa = PBXBuildFile; fileRef = D9B40076934C28BA4B92D808 /* TLSPinning.swift */; };
+		73DA73811F8AEB2AFE340D10 /* MediaPlayerController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3964F565A6C6A06399EBA4DF /* MediaPlayerController.swift */; };
 		89B47754E5C39418BFD839E6 /* TranscriptHistory.swift in Sources */ = {isa = PBXBuildFile; fileRef = 68A45228EF59186CFC219F2E /* TranscriptHistory.swift */; };
 		8DE1363CC0119B5AF9E4E117 /* ConnectionTestView.swift in Sources */ = {isa = PBXBuildFile; fileRef = AC4B9073EE8EAB51F8C55760 /* ConnectionTestView.swift */; };
 		98BA1A0F92DB7B98A8BA7814 /* SettingsView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 48F76881B4AE51DEE74511CC /* SettingsView.swift */; };
+		A86EFB492F40C26D4AA315E9 /* PinnedMediaResourceLoader.swift in Sources */ = {isa = PBXBuildFile; fileRef = 6DC3AC57ED58FC517E212F19 /* PinnedMediaResourceLoader.swift */; };
 		A94F6C509E3FE215115B2C58 /* SettingsStore.swift in Sources */ = {isa = PBXBuildFile; fileRef = 6D0D153557BB1C756ED04C61 /* SettingsStore.swift */; };
 		C00D1878C2AB3D8B6F9562B6 /* AgentMonitor.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0FC167F6658CFEC9546A7E9F /* AgentMonitor.swift */; };
+		C956D0FDFAC43925979E4077 /* MediaAPI.swift in Sources */ = {isa = PBXBuildFile; fileRef = 9191AD60FF96E44F191864E3 /* MediaAPI.swift */; };
 		CDE38FE9679472D770C601E6 /* VoiceSession.swift in Sources */ = {isa = PBXBuildFile; fileRef = EB58EEF9490F81FB2E1CE31C /* VoiceSession.swift */; };
 		D18AD347DFF72AB6361165BA /* TokenClient.swift in Sources */ = {isa = PBXBuildFile; fileRef = 9681E7410B684D2D38752A70 /* TokenClient.swift */; };
 		D2E343C8B8657316A993698E /* TranscriptHandler.swift in Sources */ = {isa = PBXBuildFile; fileRef = D82D665165A7BC1A4CBCCC6F /* TranscriptHandler.swift */; };
 		D9A0059E342955A06A021D6C /* LiveKit in Frameworks */ = {isa = PBXBuildFile; productRef = A6BAD55715F383C0DB5F306F /* LiveKit */; };
+		DE1F24919E906EE13319C7A3 /* MediaPanelView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 68FACB1A5EA6FEFD1D2613E9 /* MediaPanelView.swift */; };
 		EE0C5762EC97B123A1880FFB /* Voices.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2E5DF207EDB787F63CB3A64D /* Voices.swift */; };
 /* End PBXBuildFile section */
 
@@ -31,11 +35,15 @@
 		2A4C3CE2CA6FF828452803D1 /* Voice.app */ = {isa = PBXFileReference; includeInIndex = 0; lastKnownFileType = wrapper.application; path = Voice.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		2E5DF207EDB787F63CB3A64D /* Voices.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Voices.swift; sourceTree = "<group>"; };
 		2FED8976B60FBC13BC980FCB /* VoiceApp.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = VoiceApp.swift; sourceTree = "<group>"; };
+		3964F565A6C6A06399EBA4DF /* MediaPlayerController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MediaPlayerController.swift; sourceTree = "<group>"; };
 		3F3FA9F420065D2127B0AEC0 /* ConversationView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ConversationView.swift; sourceTree = "<group>"; };
 		48F76881B4AE51DEE74511CC /* SettingsView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SettingsView.swift; sourceTree = "<group>"; };
 		61C71C48230C683D199D6F4B /* ControlChannel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ControlChannel.swift; sourceTree = "<group>"; };
 		68A45228EF59186CFC219F2E /* TranscriptHistory.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TranscriptHistory.swift; sourceTree = "<group>"; };
+		68FACB1A5EA6FEFD1D2613E9 /* MediaPanelView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MediaPanelView.swift; sourceTree = "<group>"; };
 		6D0D153557BB1C756ED04C61 /* SettingsStore.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SettingsStore.swift; sourceTree = "<group>"; };
+		6DC3AC57ED58FC517E212F19 /* PinnedMediaResourceLoader.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PinnedMediaResourceLoader.swift; sourceTree = "<group>"; };
+		9191AD60FF96E44F191864E3 /* MediaAPI.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MediaAPI.swift; sourceTree = "<group>"; };
 		9681E7410B684D2D38752A70 /* TokenClient.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TokenClient.swift; sourceTree = "<group>"; };
 		A0C23305A6C55A83F8617D9D /* ConversationState.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ConversationState.swift; sourceTree = "<group>"; };
 		A62BAE22E3A165DCB5DFFEE1 /* OrbView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = OrbView.swift; sourceTree = "<group>"; };
@@ -58,6 +66,14 @@
 /* End PBXFrameworksBuildPhase section */
 
 /* Begin PBXGroup section */
+		0D2E974CBC286D7C886BA814 /* Media */ = {
+			isa = PBXGroup;
+			children = (
+				68FACB1A5EA6FEFD1D2613E9 /* MediaPanelView.swift */,
+			);
+			path = Media;
+			sourceTree = "<group>";
+		};
 		0DF0591DF1D767F89099F62C /* Settings */ = {
 			isa = PBXGroup;
 			children = (
@@ -111,6 +127,7 @@
 			isa = PBXGroup;
 			children = (
 				84ADAF12A43A57888CA178A6 /* Conversation */,
+				0D2E974CBC286D7C886BA814 /* Media */,
 				0DF0591DF1D767F89099F62C /* Settings */,
 			);
 			path = Features;
@@ -124,6 +141,16 @@
 			);
 			sourceTree = "<group>";
 		};
+		C12426487989358DE21A5426 /* Media */ = {
+			isa = PBXGroup;
+			children = (
+				9191AD60FF96E44F191864E3 /* MediaAPI.swift */,
+				3964F565A6C6A06399EBA4DF /* MediaPlayerController.swift */,
+				6DC3AC57ED58FC517E212F19 /* PinnedMediaResourceLoader.swift */,
+			);
+			path = Media;
+			sourceTree = "<group>";
+		};
 		CE49A38E40AAF659A9281B85 /* App */ = {
 			isa = PBXGroup;
 			children = (
@@ -140,6 +167,7 @@
 				CE49A38E40AAF659A9281B85 /* App */,
 				8DA8BEF2EE3E0F4181A94EB9 /* Features */,
 				2820A418F921E18A2FA7E4FB /* LiveKit */,
+				C12426487989358DE21A5426 /* Media */,
 				6B2AB34274D9B37E77178C6C /* Networking */,
 			);
 			path = Sources;
@@ -213,7 +241,11 @@
 				28659D009399CA9C4FE57B74 /* ControlChannel.swift in Sources */,
 				64291BBC8D0DAD47E07E94E0 /* ConversationState.swift in Sources */,
 				36DF44D9A7896F18A064847D /* ConversationView.swift in Sources */,
+				C956D0FDFAC43925979E4077 /* MediaAPI.swift in Sources */,
+				DE1F24919E906EE13319C7A3 /* MediaPanelView.swift in Sources */,
+				73DA73811F8AEB2AFE340D10 /* MediaPlayerController.swift in Sources */,
 				3E01A0AF44FD3324FA72C43C /* OrbView.swift in Sources */,
+				A86EFB492F40C26D4AA315E9 /* PinnedMediaResourceLoader.swift in Sources */,
 				302BEC55CA9A10E49C307977 /* ServerConfig.swift in Sources */,
 				A94F6C509E3FE215115B2C58 /* SettingsStore.swift in Sources */,
 				98BA1A0F92DB7B98A8BA7814 /* SettingsView.swift in Sources */,