feat: introduce device plugin runtime boundary

apps/control-station/src/composition/devicePlugins.ts

@@ -0,0 +1,8 @@
+import type { DeviceUiPlugin } from "../core/device-plugins/contracts";
+import { xgridsK1Plugin } from "../device-plugins/xgrids-k1/plugin";
+
+// Composition root: this is the only place where Mission Core chooses which
+// statically reviewed device plugins are shipped in the current build.
+export const installedDevicePlugins: readonly DeviceUiPlugin[] = Object.freeze([
+  xgridsK1Plugin,
+]);