test: dedupe fixtures and test harness setup

src/agents/models-config.test-utils.ts

@@ -0,0 +1,9 @@
+import fs from "node:fs/promises";
+import path from "node:path";
+import { resolveOpenClawAgentDir } from "./agent-paths.js";
+
+export async function readGeneratedModelsJson<T>(): Promise<T> {
+  const modelPath = path.join(resolveOpenClawAgentDir(), "models.json");
+  const raw = await fs.readFile(modelPath, "utf8");
+  return JSON.parse(raw) as T;
+}