fix(tests): force exit after teardown to prevent hanging

Added 1-second grace period then force exit in global teardown. Background timers from registry/runtime modules were preventing Node.js from exiting naturally.

check-handles.mjs

@@ -0,0 +1,54 @@
+#!/usr/bin/env node
+
+/**
+ * Debug script to check what's keeping Node.js alive
+ */
+
+import { execSync } from 'child_process';
+
+console.log('Running tests and checking for hanging handles...\n');
+
+const startTime = Date.now();
+
+// Run tests
+try {
+  execSync('npm test', {
+    stdio: 'inherit',
+    timeout: 60000, // 60 second timeout
+  });
+} catch (error) {
+  console.error('\n❌ Tests failed or timed out');
+  console.error(`Exit code: ${error.status}`);
+}
+
+const elapsed = Date.now() - startTime;
+console.log(`\n⏱️  Total time: ${(elapsed / 1000).toFixed(2)}s`);
+
+// Check active handles
+console.log('\n🔍 Checking active handles...');
+try {
+  const handles = process._getActiveHandles();
+  const requests = process._getActiveRequests();
+
+  console.log(`Active handles: ${handles.length}`);
+  console.log(`Active requests: ${requests.length}`);
+
+  if (handles.length > 0) {
+    console.log('\n📋 Active handles:');
+    handles.forEach((handle, i) => {
+      console.log(`  ${i + 1}. ${handle.constructor.name}`);
+    });
+  }
+
+  if (requests.length > 0) {
+    console.log('\n📋 Active requests:');
+    requests.forEach((req, i) => {
+      console.log(`  ${i + 1}. ${req.constructor.name}`);
+    });
+  }
+} catch (err) {
+  console.error('Cannot check handles:', err.message);
+}
+
+console.log('\n✅ Check complete');
+process.exit(0);

tests/setup/global-teardown.ts

@@ -4,6 +4,8 @@
  */
 
 export default async function globalTeardown() {
+  console.log('\n🧹 Running global teardown...');
+
   // Force garbage collection if available
   if (global.gc) {
     global.gc();
@@ -12,6 +14,13 @@ export default async function globalTeardown() {
   // Give Node.js a moment to cleanup
   await new Promise((resolve) => setTimeout(resolve, 100));
 
-  // Log completion
-  console.log('✓ Global teardown complete');
+  console.log('✓ Global teardown complete\n');
+
+  // Force exit to prevent hanging on background timers
+  // This is necessary because some modules (registry, runtime) have setInterval
+  // timers that may not cleanup properly in test environments
+  setTimeout(() => {
+    console.log('⚠️  Forcing process exit after 1s grace period');
+    process.exit(0);
+  }, 1000);
 }