M3: channels/threads + cron delivery + search + outbox sync

Gateway plugin:
- ChannelDirectory (SQLite): channels + threads, friendly-name resolution
- FTS5 search bridge over state.db (scope all/chat, LIKE fallback)
- Outbox (monotonic cursor, 72h retention) for reconnect catch-up
- adapter: channel.* handlers, search, sync, cron target parsing
- ws_server: M3 frame routing + hello.ack sync cursor

App (KMP):
- ChannelStore (directory cache) + lane-aware ChatStore (per chat/thread)
- GatewayClient.sendFrame; IrisController channel/search/nav actions
- ChatScreen: channel drawer, thread toggle, topic switcher, search overlay

gateway-plugin/ws_server.py

@@ -240,7 +240,7 @@ class WsServer:
 
         ack = protocol.hello_ack(
             server_caps=self._adapter.server_caps(),
-            sync_cursor=0,  # outbox lands in M3; cursor starts at 0
+            sync_cursor=self._adapter._outbox.latest_cursor(),
             channels=self._adapter.channel_list(),
         )
         try:
@@ -276,6 +276,20 @@ class WsServer:
             await self._send_quiet(ws, protocol.pong(ts if isinstance(ts, int) else None))
         elif frame.type == protocol.TYPE_MESSAGE_SEND:
             await self._adapter.on_message_send(frame, device_id)
+        elif frame.type == protocol.TYPE_CHANNEL_CREATE:
+            await self._adapter.on_channel_create(frame, device_id)
+        elif frame.type == protocol.TYPE_CHANNEL_RENAME:
+            await self._adapter.on_channel_rename(frame, device_id)
+        elif frame.type == protocol.TYPE_CHANNEL_SET_DEFAULT:
+            await self._adapter.on_channel_set_default(frame, device_id)
+        elif frame.type == protocol.TYPE_CHANNEL_DELETE:
+            await self._adapter.on_channel_delete(frame, device_id)
+        elif frame.type == protocol.TYPE_CHANNEL_LIST:
+            await self._adapter.on_channel_list(frame, device_id)
+        elif frame.type == protocol.TYPE_SEARCH:
+            await self._adapter.on_search(frame, device_id)
+        elif frame.type == protocol.TYPE_SYNC:
+            await self._adapter.on_sync(frame, device_id)
         elif frame.type == "fcm.register":
             fcm_token = frame.payload.get("fcm_token")
             ntfy_topic = frame.payload.get("ntfy_topic")