feat: HWP scaling, C1E, closed-loop thermal governor for Intel CPUs

kernel/src/ACPI/CpuIdle.hpp

@@ -29,5 +29,9 @@ namespace Hal {
         void WaitShallowWithInterruptsDisabled(bool hasMwait,
                                                volatile uint64_t* monitorAddr = nullptr);
 
+        // The MWAIT hint APs use for deep idle (0 = plain C1). Exposed for
+        // SYS_POWERINFO diagnostics.
+        uint8_t GetApIdleHint();
+
     };
 };