test: make context-manager test script match test layout

package.json

@@ -4,7 +4,7 @@
   "type": "module",
   "keywords": ["pi-package"],
   "scripts": {
-    "test": "tsx --test src/*.test.ts src/**/*.test.ts"
+    "test": "tsx --test src/*.test.ts"
   },
   "files": ["index.ts", "src"],
   "pi": {

src/package-manifest.test.ts

@@ -15,6 +15,7 @@ test("package.json exposes pi-context-manager as a standalone pi package", () =>
   assert.deepEqual(pkg.pi, {
     extensions: ["./index.ts"],
   });
+  assert.equal(pkg.scripts.test, "tsx --test src/*.test.ts");
 
   assert.equal(pkg.peerDependencies["@mariozechner/pi-agent-core"], "*");
   assert.equal(pkg.peerDependencies["@mariozechner/pi-coding-agent"], "*");