Add Mode6Test: copy of Mode5Test running on port 3000

ModeSwitch/activeMode.txt

@@ -1 +1 @@
-Mode3Test
+Mode6Test

ModeSwitch/backend/orchestrator.ts

@@ -14,6 +14,7 @@ const MODE_FOLDERS: Record<string, string> = {
   'Mode1Test': 'Mode1Test',
   'Mode2Test': 'Mode2Test',
   'Mode3Test': 'Mode3Test',
+  'Mode5Test': 'Mode5Test',
 };
 
 let currentMode: string = 'Mode1Test';
@@ -91,8 +92,12 @@ async function startMode(mode: string): Promise<boolean> {
 
     // Start the mode's backend server
     currentProcess = Bun.spawn({
-      cmd: ['bun', 'run', serverPath],
+      cmd: [process.execPath, 'run', serverPath],
       cwd: modePath,
+      env: {
+        // Force mode service to bind to shared port
+        PORT: String(SHARED_PORT),
+      },
       stdout: 'pipe',
       stderr: 'pipe',
     });