fix(metrics): enforce exact runtime inventory

scripts/runtime-source-classifier.js

@@ -0,0 +1,12 @@
+function isTestFile(filePath) {
+  const normalizedPath = filePath.replace(/\\/g, '/');
+  return (
+    /(^|\/)(__tests__|__mocks__|fixtures)(\/|$)/.test(normalizedPath) ||
+    /(^|\/)(tests?|test-fixtures)(\/|$)/.test(normalizedPath) ||
+    /\.(test|spec)\.[^.]+$/.test(normalizedPath)
+  );
+}
+
+module.exports = {
+  isTestFile,
+};