feat: add SYS_FUTEX_WAIT and SYS_FUTEX_WAKE syscalls; revamp desktop application categories

kernel/src/Api/Syscall.cpp

@@ -545,6 +545,13 @@ namespace montauk::abi {
                 return Sys_ThreadJoin((int)frame->arg1, (int*)frame->arg2);
             case SYS_THREAD_SELF:
                 return Sys_ThreadSelf();
+            case SYS_FUTEX_WAIT:
+                // Validation demand-commits the page so the scheduler can
+                // read the word with its lock held without faulting.
+                if (!UserMemory::Readable<uint32_t>(frame->arg1)) return BadPointer;
+                return Sys_FutexWait(frame->arg1, (uint32_t)frame->arg2, frame->arg3);
+            case SYS_FUTEX_WAKE:
+                return Sys_FutexWake(frame->arg1, (uint32_t)frame->arg2);
             case SYS_BTSCAN:
                 if (!Sched::HasCapability(CAP_DEVICE_ADMIN)) return CapabilityDenied;
                 if ((int64_t)frame->arg2 < 0) return InvalidArgument;