fix: make plugin settings optional

settings not needed at this stage

src/types/plugin-inputs.ts

@@ -18,7 +18,7 @@ export interface PluginInputs<T extends SupportedEventsU = SupportedEventsU, TU
  * The kernel will extract those and pass them to the plugin,
  * which are built into the context object from setup().
  */
-export const pluginSettingsSchema = T.Object({}, { default: {} });
+export const pluginSettingsSchema = T.Optional(T.Object({}, { default: {} }));
 
 export const pluginSettingsValidator = new StandardValidator(pluginSettingsSchema);