fix: make npm test run on Windows (node <21)

The test scripts pass a 'tests/*.test.js' / './test/*.test.js' glob to
node --test. POSIX shells expand it, but cmd.exe does not and node <21
does not glob --test paths natively, so npm test fails for every Windows
contributor with 'Could not find ...'. Pass the directory instead; node
discovers the *.test.js files itself. Same files run (verified), now
cross-platform.

Author: Lakshya77089

package.json

@@ -5,7 +5,7 @@
   "keywords": ["pi-package", "pi", "skills", "ponytail"],
   "license": "MIT",
   "scripts": {
-    "test": "node --test tests/*.test.js && npm test --prefix pi-extension"
+    "test": "node --test tests/ && npm test --prefix pi-extension"
   },
   "pi": {
     "extensions": ["./pi-extension/index.js"],

pi-extension/package.json

@@ -3,6 +3,6 @@
   "private": true,
   "type": "module",
   "scripts": {
-    "test": "node --test ./test/*.test.js"
+    "test": "node --test ./test/"
   }
 }