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.

tests/test_switch2_usb_probe_protocol_native.py

@@ -0,0 +1,51 @@
+from __future__ import annotations
+
+import os
+import shutil
+import subprocess
+from pathlib import Path
+
+import pytest
+
+
+def test_switch2_usb_probe_deferred_sample(tmp_path: Path) -> None:
+    root = Path(__file__).resolve().parents[1]
+    compiler = shutil.which("cc") or shutil.which("gcc")
+    assert compiler is not None, "a host C compiler is required"
+    sdk_candidates = [
+        root / "build" / "_deps" / "pico_sdk-src",
+        root / "external" / "pico-sdk",
+    ]
+    if sdk_path := os.environ.get("PICO_SDK_PATH"):
+        sdk_candidates.insert(0, Path(sdk_path))
+    mbedtls = next(
+        (sdk / "lib" / "mbedtls" for sdk in sdk_candidates
+         if (sdk / "lib" / "mbedtls" / "library" / "aes.c").is_file()),
+        None,
+    )
+    if mbedtls is None:
+        pytest.skip("Pico SDK mbedTLS required; configure firmware or set PICO_SDK_PATH")
+    probe = root / "tools" / "switch2_usb_probe"
+    executable = tmp_path / "switch2_usb_probe_protocol"
+    subprocess.run(
+        [
+            compiler,
+            "-std=c11",
+            "-Wall",
+            "-Wextra",
+            "-Werror",
+            "-pedantic",
+            f'-DMBEDTLS_CONFIG_FILE="{probe / "mbedtls_config.h"}"',
+            f"-I{probe}",
+            f"-I{mbedtls / 'include'}",
+            str(probe / "protocol.c"),
+            str(mbedtls / "library" / "aes.c"),
+            str(mbedtls / "library" / "platform_util.c"),
+            str(root / "tests" / "switch2_usb_probe_protocol_test.c"),
+            "-o",
+            str(executable),
+        ],
+        check=True,
+        cwd=root,
+    )
+    subprocess.run([str(executable)], check=True, cwd=root)