refactor(core): dedupe shared config and runtime helpers

src/test-utils/exec-assertions.ts

@@ -0,0 +1,16 @@
+import { expect } from "vitest";
+
+export function expectSingleNpmInstallIgnoreScriptsCall(params: {
+  calls: Array<[unknown, { cwd?: string } | undefined]>;
+  expectedCwd: string;
+}) {
+  const npmCalls = params.calls.filter((call) => Array.isArray(call[0]) && call[0][0] === "npm");
+  expect(npmCalls.length).toBe(1);
+  const first = npmCalls[0];
+  if (!first) {
+    throw new Error("expected npm install call");
+  }
+  const [argv, opts] = first;
+  expect(argv).toEqual(["npm", "install", "--omit=dev", "--silent", "--ignore-scripts"]);
+  expect(opts?.cwd).toBe(params.expectedCwd);
+}