fix: fix faulty syscall result/status code compares

programs/include/montauk/statuscodes.h

@@ -60,6 +60,13 @@ inline const char* GetStatusText(StatusCode statusCode) {
     }
 }
 
+// Map a raw syscall result to a StatusCode.
+inline StatusCode StatusFromResult(long long rc) {
+    if (rc >= 0) return Success;
+    if (rc < -(long long)WouldBlock) return GenericFailure;
+    return (StatusCode)(-rc);
+}
+
 // Shared with C (libc.c), so no nullptr.
 inline const char* GetStatusExplanationText(StatusCode statusCode) {
     const char* explanationText[] = {