feat: further kernel power and power optimizations

kernel/src/Sched/Scheduler.hpp

@@ -116,6 +116,11 @@ namespace Sched {
     // timeoutMs == 0 means wait indefinitely.
     void BlockOnObject(void* object, uint64_t timeoutMs = 0);
 
+    // Atomically check a condition under the scheduler lock and block only if
+    // it still holds. This prevents lost wakeups for edge-triggered waiters.
+    bool BlockOnObjectIf(void* object, uint64_t timeoutMs,
+                         bool (*shouldBlock)(void*), void* context);
+
     // BSP-only scheduler housekeeping: wake expired sleepers and reclaim
     // terminated process resources.
     void RunBspMaintenance();