feat: first cut at actual token generation and model loading

src/engine/gguf.rs

@@ -170,6 +170,10 @@ impl Gguf {
         self.map.len() as u64
     }
 
+    pub(super) fn map_ptr(&self) -> *const u8 {
+        self.map.as_ptr()
+    }
+
     pub(super) fn tensor(&self, name: &str) -> Result<&Tensor, String> {
         self.tensors
             .get(name)