refactor(src): split oversized modules

src/imessage/monitor/runtime.ts

@@ -0,0 +1,18 @@
+import type { RuntimeEnv } from "../../runtime.js";
+import type { MonitorIMessageOpts } from "./types.js";
+
+export function resolveRuntime(opts: MonitorIMessageOpts): RuntimeEnv {
+  return (
+    opts.runtime ?? {
+      log: console.log,
+      error: console.error,
+      exit: (code: number): never => {
+        throw new Error(`exit ${code}`);
+      },
+    }
+  );
+}
+
+export function normalizeAllowList(list?: Array<string | number>) {
+  return (list ?? []).map((entry) => String(entry).trim()).filter(Boolean);
+}