Add protocol facade

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

switch_protocol.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#include <stdint.h>
+
+#include "switch_input.h"
+
+using SwitchRumbleCallback = void (*)(const uint8_t rumble_data[8]);
+
+void switch_protocol_init();
+void switch_protocol_set_input(const SwitchInputState& state);
+void switch_protocol_task();
+bool switch_protocol_is_ready();
+void switch_protocol_set_rumble_callback(SwitchRumbleCallback callback);