fix: Reload echoes/acks after device name detection

When MC_DEVICE_NAME=auto, _load_echoes() runs with "auto.echoes.jsonl"
which doesn't exist. After actual device name is detected and paths
updated, the data was never reloaded from the correct file, leaving
incoming_paths and echo_counts empty. This caused missing path info
for all messages older than the current bridge session.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

meshcore-bridge/bridge.py

@@ -188,6 +188,11 @@ class MeshCLISession:
         self.acks_file = new_acks
         logger.info(f"Log paths updated for device: {new_name}")
 
+        # Reload echo and ACK data from the correct files
+        # (initial _load_echoes/_load_acks may have failed with the "auto" name)
+        self._load_echoes()
+        self._load_acks()
+
     def _start_session(self):
         """Start meshcli process and worker threads"""
         logger.info(f"Starting meshcli session on {self.serial_port}")