Implement nova64 API with native yield function and registration

software/init.zig

@@ -0,0 +1,12 @@
+extern "nova64" fn yield(timeout_ms: u32) void;
+
+pub fn main() void {
+    _ = add(1, 2);
+    while (true) {
+        yield(16); // Yield for 1 second
+    }
+}
+
+export fn add(a: i32, b: i32) i32 {
+    return a + b;
+}