feat: write exit code to stderr on process termination

src/cli.ts

@@ -555,11 +555,13 @@ program
     // Register signal handlers
     process.on('SIGINT', async () => {
       await performCleanup('SIGINT');
+      console.error(`Process exiting with code: 130`);
       process.exit(130); // Standard exit code for SIGINT
     });
 
     process.on('SIGTERM', async () => {
       await performCleanup('SIGTERM');
+      console.error(`Process exiting with code: 143`);
       process.exit(143); // Standard exit code for SIGTERM
     });
 
@@ -585,10 +587,12 @@ program
         }
       );
 
+      console.error(`Process exiting with code: ${exitCode}`);
       process.exit(exitCode);
     } catch (error) {
       logger.error('Fatal error:', error);
       await performCleanup();
+      console.error(`Process exiting with code: 1`);
       process.exit(1);
     }
   });

tests/integration/basic-firewall.test.ts

@@ -162,4 +162,26 @@ describe('Basic Firewall Functionality', () => {
     await docker.rm('awf-squid', true);
     await docker.rm('awf-agent', true);
   }, 120000);
+
+  test('Test 10: Exit code written to stderr (success)', async () => {
+    const result = await runner.runWithSudo('exit 0', {
+      allowDomains: ['github.com'],
+      logLevel: 'debug',
+      timeout: 30000,
+    });
+
+    expect(result).toExitWithCode(0);
+    expect(result.stderr).toContain('Process exiting with code: 0');
+  }, 120000);
+
+  test('Test 11: Exit code written to stderr (failure)', async () => {
+    const result = await runner.runWithSudo('exit 42', {
+      allowDomains: ['github.com'],
+      logLevel: 'debug',
+      timeout: 30000,
+    });
+
+    expect(result).toExitWithCode(42);
+    expect(result.stderr).toContain('Process exiting with code: 42');
+  }, 120000);
 });