feat(plugins): add inject_message interface for remote message injection (#3778)

cli.py

@@ -6210,6 +6210,11 @@ class HermesCLI:
         self._interrupt_queue = queue.Queue()   # For messages typed while agent is running
         self._should_exit = False
         self._last_ctrl_c_time = 0  # Track double Ctrl+C for force exit
+
+        # Give plugin manager a CLI reference so plugins can inject messages
+        from hermes_cli.plugins import get_plugin_manager
+        get_plugin_manager()._cli_ref = self
+
         # Config file watcher — detect mcp_servers changes and auto-reload
         from hermes_cli.config import get_config_path as _get_config_path
         _cfg_path = _get_config_path()