use virtual workspaces for heap

NovaError/Cargo.toml

@@ -0,0 +1,4 @@
+[package]
+name = "NovaError"
+version = "0.1.0"
+edition = "2024"

NovaError/src/lib.rs

@@ -0,0 +1,11 @@
+#![no_std]
+
+use core::fmt::Debug;
+use core::prelude::rust_2024::derive;
+
+#[derive(Debug)]
+pub enum NovaError {
+    Mailbox,
+    HeapFull,
+    EmptyHeapSegmentNotAllowed,
+}