Add verified Joy-Con 2 USB bridge with native mouse support

Implement the standalone USB protocol probe and Bluetooth-backed right Joy-Con bridge with its own persistent virtual pairing identity. Preserve complete ordered native reports, including opaque motion data, and match the console feature set. Relay built-in vibration cues only after genuine source acknowledgement and expose safe BOOTSEL pairing control. Include native capture diagnostics and focused protocol, packet-lifecycle, and cue regressions. Native mouse operation confirmed on Switch with bridge 0.24; private captures and firmware backups remain outside the commit.

tools/switch2_usb_probe/tusb_config.h

@@ -0,0 +1,31 @@
+#pragma once
+
+#define CFG_TUSB_RHPORT0_MODE (OPT_MODE_DEVICE | OPT_MODE_FULL_SPEED)
+#ifndef CFG_TUSB_OS
+#define CFG_TUSB_OS OPT_OS_NONE
+#endif
+#define CFG_TUD_ENDPOINT0_SIZE 64
+#define CFG_TUD_HID 1
+#define CFG_TUD_HID_EP_BUFSIZE 64
+#define CFG_TUD_CDC 0
+#define CFG_TUD_MSC 0
+#define CFG_TUD_MIDI 0
+#define CFG_TUD_VENDOR 1
+#define CFG_TUD_VENDOR_EPSIZE 64
+#define CFG_TUD_VENDOR_RX_BUFSIZE 256
+#define CFG_TUD_VENDOR_TX_BUFSIZE 256
+#ifdef CFG_TUSB_DEBUG
+#undef CFG_TUSB_DEBUG
+#endif
+// Packet-level SDK logging would overflow 115200 baud while streaming input.
+// Requests, command payloads, errors and aggregate counters are logged explicitly.
+#define CFG_TUSB_DEBUG 1
+#define CFG_TUSB_DEBUG_PRINTF probe_debug_printf
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+int probe_debug_printf(const char* format, ...);
+#ifdef __cplusplus
+}
+#endif