refactor: share extension monitor runtime setup

extensions/shared/runtime.ts

@@ -0,0 +1,14 @@
+import { createLoggerBackedRuntime } from "openclaw/plugin-sdk";
+
+export function resolveLoggerBackedRuntime<TRuntime>(
+  runtime: TRuntime | undefined,
+  logger: Parameters<typeof createLoggerBackedRuntime>[0]["logger"],
+): TRuntime {
+  return (
+    runtime ??
+    (createLoggerBackedRuntime({
+      logger,
+      exitError: () => new Error("Runtime exit not available"),
+    }) as TRuntime)
+  );
+}