fix: implement TODOs for call duration, contact lookup, and event queue

- VoiceCallService: Track call start time and calculate actual duration on disconnect
- CallScreener: Implement contact lookup via ContactsContract.PhoneLookup
- GatewayClient: Add event queue (max 100) for offline buffering, flush on reconnect
- ClawdNodeApp: Route call handlers through CallManager instead of TODOs

app/src/main/java/com/inou/clawdnode/ClawdNodeApp.kt

@@ -9,6 +9,7 @@ import com.inou.clawdnode.gateway.DirectGateway
 import com.inou.clawdnode.security.AuditLog
 import com.inou.clawdnode.security.DeviceIdentity
 import com.inou.clawdnode.security.TokenStore
+import com.inou.clawdnode.service.CallManager
 import com.inou.clawdnode.service.NotificationManager as AppNotificationManager
 
 /**
@@ -58,17 +59,17 @@ class ClawdNodeApp : Application() {
         
         DirectGateway.onCallAnswer = { callId ->
             auditLog.log("COMMAND_RECEIVED", "call.answer: $callId")
-            // TODO: Implement call answering via TelecomManager
+            CallManager.answer(callId, null)
         }
         
         DirectGateway.onCallReject = { callId ->
             auditLog.log("COMMAND_RECEIVED", "call.reject: $callId")
-            // TODO: Implement call rejection
+            CallManager.reject(callId, null)
         }
         
         DirectGateway.onCallHangup = { callId ->
             auditLog.log("COMMAND_RECEIVED", "call.hangup: $callId")
-            // TODO: Implement call hangup
+            CallManager.hangup(callId)
         }
         
         // Connect

app/src/main/java/com/inou/clawdnode/calls/CallScreener.kt

@@ -4,7 +4,10 @@ import android.content.ComponentName
 import android.content.Context
 import android.content.Intent
 import android.content.ServiceConnection
+import android.database.Cursor
+import android.net.Uri
 import android.os.IBinder
+import android.provider.ContactsContract
 import android.telecom.Call
 import android.telecom.CallScreeningService
 import android.util.Log
@@ -104,9 +107,26 @@ class CallScreener : CallScreeningService() {
     }
     
     private fun lookupContact(number: String): String? {
-        // TODO: Look up in contacts
-        // For now, return null (unknown caller)
-        return null
+        return try {
+            val uri = Uri.withAppendedPath(
+                ContactsContract.PhoneLookup.CONTENT_FILTER_URI,
+                Uri.encode(number)
+            )
+            val projection = arrayOf(ContactsContract.PhoneLookup.DISPLAY_NAME)
+            
+            contentResolver.query(uri, projection, null, null, null)?.use { cursor ->
+                if (cursor.moveToFirst()) {
+                    cursor.getString(
+                        cursor.getColumnIndexOrThrow(ContactsContract.PhoneLookup.DISPLAY_NAME)
+                    )
+                } else {
+                    null
+                }
+            }
+        } catch (e: Exception) {
+            Log.w(tag, "Contact lookup failed for $number: ${e.message}")
+            null
+        }
     }
 }
 

app/src/main/java/com/inou/clawdnode/calls/VoiceCallService.kt

@@ -40,6 +40,7 @@ class VoiceCallService : InCallService(), TextToSpeech.OnInitListener {
     private var audioManager: AudioManager? = null
     
     private val activeCalls = mutableMapOf<String, Call>()
+    private val callStartTimes = mutableMapOf<String, Long>()
     private var currentCallId: String? = null
     private var isListening = false
     
@@ -135,25 +136,32 @@ class VoiceCallService : InCallService(), TextToSpeech.OnInitListener {
         
         when (state) {
             Call.STATE_ACTIVE -> {
-                // Call is active, start listening
+                // Call is active, record start time and start listening
+                callStartTimes[callId] = System.currentTimeMillis()
                 currentCallId = callId
                 startListening()
             }
             Call.STATE_DISCONNECTED -> {
-                // Call ended
-                val duration = 0 // TODO: Calculate actual duration
-                DirectGateway.sendCall(
-                    callId = callId,
-                    number = call.details.handle?.schemeSpecificPart,
-                    contact = null,
-                    state = "ended"
-                )
+                // Call ended - calculate duration
+                val startTime = callStartTimes.remove(callId)
+                val duration = if (startTime != null) {
+                    ((System.currentTimeMillis() - startTime) / 1000).toInt()
+                } else {
+                    0
+                }
+                
+                DirectGateway.sendLog("call.ended", mapOf(
+                    "callId" to callId,
+                    "number" to (call.details.handle?.schemeSpecificPart ?: "unknown"),
+                    "duration" to duration,
+                    "outcome" to "completed"
+                ))
                 
                 ClawdNodeApp.instance.auditLog.logCall(
                     "CALL_ENDED",
                     call.details.handle?.schemeSpecificPart,
                     null,
-                    "completed"
+                    "completed (${duration}s)"
                 )
             }
         }

app/src/main/java/com/inou/clawdnode/service/GatewayClient.kt

@@ -62,6 +62,10 @@ class GatewayClient(
     private val scope = CoroutineScope(Dispatchers.IO + SupervisorJob())
     private val requestIdCounter = AtomicInteger(0)
     
+    // Queue for events when disconnected (max 100 to prevent memory issues)
+    private val eventQueue = mutableListOf<NodeEvent>()
+    private val maxQueueSize = 100
+    
     private val auditLog get() = ClawdNodeApp.instance.auditLog
     private val tokenStore get() = ClawdNodeApp.instance.tokenStore
     
@@ -146,8 +150,33 @@ class GatewayClient(
         if (isConnected && isHandshakeComplete) {
             webSocket?.send(json)
         } else {
-            log("Not connected or handshake incomplete, cannot send event")
-            // TODO: Queue for retry
+            // Queue for retry when reconnected
+            synchronized(eventQueue) {
+                if (eventQueue.size >= maxQueueSize) {
+                    // Drop oldest event to make room
+                    val dropped = eventQueue.removeAt(0)
+                    log("Queue full, dropped oldest event: ${dropped.type}")
+                }
+                eventQueue.add(event)
+                log("Queued event for retry (queue size: ${eventQueue.size})")
+            }
+        }
+    }
+    
+    private fun flushEventQueue() {
+        val eventsToSend: List<NodeEvent>
+        synchronized(eventQueue) {
+            eventsToSend = eventQueue.toList()
+            eventQueue.clear()
+        }
+        
+        if (eventsToSend.isNotEmpty()) {
+            log("Flushing ${eventsToSend.size} queued events")
+            eventsToSend.forEach { event ->
+                val requestId = generateRequestId()
+                val json = event.toProtocolFrame(requestId)
+                webSocket?.send(json)
+            }
         }
     }
     
@@ -365,6 +394,9 @@ class GatewayClient(
         isHandshakeComplete = true
         onConnectionChange(true)
         auditLog.log("GATEWAY_CONNECTED", "Protocol v$protocol handshake complete")
+        
+        // Send any queued events
+        flushEventQueue()
     }
     
     private fun handleDisconnect() {