feat: unify system status codes

kernel/src/Common/StatusCodes.hpp

@@ -0,0 +1,28 @@
+/*
+    * StatusCodes.hpp
+    * MontaukOS system status codes.
+    * Copyright (c) 2026 Daniel Hammer
+*/
+
+#pragma once
+
+// Syscall return status. Mirrored for userspace in
+// programs/include/montauk/statuscodes.h and, as MTK_STATUS_*, in
+// programs/include/libc/montauk.h; scripts/montauk-syscalls.py checks all three.
+enum StatusCodes {
+    Success = 0,
+    GenericFailure = -1,
+    PermissionDenied = -2,
+    CapabilityDenied = -3,
+    SystemIntegrityError = -4,
+    BadPointer = -5,
+    InvalidArgument = -6,
+    UnsupportedOp = -7,
+    NoDevice = -8,
+    IoFailure = -9,
+    BadInvocation = -10,
+    NoSuchPath = -11,
+    Busy = -12,
+    BufferTooSmall = -13,
+    OutOfMemory = -14
+};