feat: add profiled DualSense PCM haptics experiment

tests/haptics_experiment_native_stubs/pico/critical_section.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include <cassert>
+
+struct critical_section_t {
+    bool initialized = false;
+};
+
+inline unsigned native_haptics_lock_depth = 0;
+
+inline void critical_section_init(critical_section_t* section) {
+    assert(!section->initialized);
+    section->initialized = true;
+}
+inline void critical_section_enter_blocking(critical_section_t* section) {
+    assert(section->initialized);
+    assert(native_haptics_lock_depth == 0);
+    ++native_haptics_lock_depth;
+}
+inline void critical_section_exit(critical_section_t*) {
+    assert(native_haptics_lock_depth == 1);
+    --native_haptics_lock_depth;
+}

tests/haptics_experiment_native_stubs/pico/stdlib.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#include <stdint.h>
+
+uint64_t time_us_64();
+
+// Match SDK section spelling so the RAM build compiles the real annotations.
+#define __not_in_flash(group) __attribute__((section(".time_critical." group)))
+#define __time_critical_func(name) __not_in_flash(#name) name