Add protocol facade

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

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

switch_legacy_protocol.cpp

@@ -0,0 +1,23 @@
+#include "switch_protocol.h"
+
+#include "switch_pro_driver.h"
+
+void switch_protocol_init() {
+    switch_pro_init();
+}
+
+void switch_protocol_set_input(const SwitchInputState& state) {
+    switch_pro_set_input(state);
+}
+
+void switch_protocol_task() {
+    switch_pro_task();
+}
+
+bool switch_protocol_is_ready() {
+    return switch_pro_is_ready();
+}
+
+void switch_protocol_set_rumble_callback(SwitchRumbleCallback callback) {
+    switch_pro_set_rumble_callback(callback);
+}

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);