Enable auto-execution on USB attack modules for aggressive exploitation

- HID Inject: auto-triggers payload injection on host detection
- USB Gadget: auto-detects best device class and enumerates immediately
- JTAG USB Bridge: auto-detects protocol and starts bridging on entry
- RNDIS Bridge: auto-starts ethernet gadget and DHCP server on entry
- USB Sniffer: auto-captures packets immediately on entry

All USB modules now auto-execute without manual trigger, enabling plug-and-exploit workflow.

src/modules/usbsniffer.cpp

@@ -17,10 +17,11 @@ public:
   const char* blurb() const override { return "monitor USB traffic"; }
 
   void onEnter() override {
-    active = false;
+    active = true;
     packetCount = 0;
     dataBytes = 0;
     say("USB sniffer ready");
+    say("Auto-starting packet capture");
   }
   void onExit() override { active = false; }