Revert "Mesh gossip (#381)" (#394)

This reverts commit 0969c0641e.

app/src/main/java/com/bitchat/android/mesh/MessageHandler.kt

@@ -240,13 +240,6 @@ class MessageHandler(private val myPeerID: String) {
             previousPeerID = null
         )
         
-        // Update mesh graph from gossip neighbors (only if TLV present)
-        try {
-            val neighborsOrNull = com.bitchat.android.services.meshgraph.GossipTLV.decodeNeighborsFromAnnouncementPayload(packet.payload)
-            com.bitchat.android.services.meshgraph.MeshGraphService.getInstance()
-                .updateFromAnnouncement(peerID, nickname, neighborsOrNull, packet.timestamp)
-        } catch (_: Exception) { }
-
         Log.d(TAG, "✅ Processed verified TLV announce: stored identity for $peerID")
         return isFirstAnnounce
     }