Fix api page tests creating routes

src/__tests__/pages/api/mcp/index.test.js

@@ -34,7 +34,7 @@ function mockResponse() {
 
 async function loadHandler() {
   vi.resetModules();
-  return (await import("./index")).default;
+  return (await import("pages/api/mcp/index")).default;
 }
 
 describe("pages/api/mcp", () => {

src/__tests__/pages/api/services/proxy-request-shaping.test.js

@@ -57,7 +57,7 @@ vi.mock("widgets/widgets", () => ({
   },
 }));
 
-import handler from "./proxy";
+import handler from "pages/api/services/proxy";
 
 function createReq({ method = "GET", body, query = {} } = {}) {
   return { method, body, query };

src/__tests__/pages/no-colocated-tests.test.js

@@ -0,0 +1,19 @@
+import { readdirSync } from "fs";
+
+import { expect, it } from "vitest";
+
+// Next compiles everything under src/pages into routes, so a colocated test ships
+// to users and drags its dev dependencies into the runtime image.
+function filesIn(dir, found = []) {
+  readdirSync(dir, { withFileTypes: true }).forEach((entry) => {
+    const path = `${dir}/${entry.name}`;
+    if (entry.isDirectory()) filesIn(path, found);
+    else found.push(path);
+  });
+  return found;
+}
+
+it("keeps test files out of src/pages", () => {
+  const tests = filesIn("src/pages").filter((path) => /\.(test|spec)\.[jt]sx?$/.test(path));
+  expect(tests).toEqual([]);
+});