fix(tui): apply terminal backend config before launch

tests/hermes_cli/test_web_server.py

@@ -4146,6 +4146,39 @@ class TestPtyWebSocket:
         assert env["HERMES_TUI_INLINE"] == "1"
         assert env["HERMES_TUI_DISABLE_MOUSE"] == "1"
 
+    def test_resolve_chat_argv_applies_terminal_backend_config(
+        self, monkeypatch, _isolate_hermes_home
+    ):
+        import hermes_cli.main as main_mod
+
+        config_path = Path(os.environ["HERMES_HOME"]) / "config.yaml"
+        config_path.write_text(
+            "\n".join(
+                [
+                    "terminal:",
+                    "  backend: docker",
+                    "  docker_image: example/hermes-tools:latest",
+                    "  docker_extra_args:",
+                    "    - --network=host",
+                ]
+            ),
+            encoding="utf-8",
+        )
+        monkeypatch.delenv("TERMINAL_ENV", raising=False)
+        monkeypatch.delenv("TERMINAL_DOCKER_IMAGE", raising=False)
+        monkeypatch.delenv("TERMINAL_DOCKER_EXTRA_ARGS", raising=False)
+        monkeypatch.setattr(
+            main_mod,
+            "_make_tui_argv",
+            lambda project_root, tui_dev=False: (["node", "dist/entry.js"], "/tmp/ui-tui"),
+        )
+
+        _argv, _cwd, env = self.ws_module._resolve_chat_argv()
+
+        assert env["TERMINAL_ENV"] == "docker"
+        assert env["TERMINAL_DOCKER_IMAGE"] == "example/hermes-tools:latest"
+        assert env["TERMINAL_DOCKER_EXTRA_ARGS"] == '["--network=host"]'
+
     def test_rejects_when_embedded_chat_disabled(self, monkeypatch):
         monkeypatch.setattr(self.ws_module, "_DASHBOARD_EMBEDDED_CHAT_ENABLED", False)
         from starlette.websockets import WebSocketDisconnect