json(vm): fix birth dispatch; unify constructor naming (Box.birth/N); JsonNode factories return JsonNodeInstance; quick: enable heavy JSON with probe; builder: NYASH_BUILDER_DEBUG_LIMIT guard; json_query_min(core) harness; docs/tasks updated

src/backend/mir_interpreter/handlers/misc.rs

@@ -11,6 +11,20 @@ impl MirInterpreter {
 
     pub(super) fn handle_print(&mut self, value: ValueId) -> Result<(), VMError> {
         let v = self.reg_load(value)?;
+        // Align with calls.rs behavior: Void/BoxRef(VoidBox) prints as null; raw String/StringBox unquoted
+        match &v {
+            VMValue::Void => { println!("null"); return Ok(()); }
+            VMValue::BoxRef(bx) => {
+                if bx.as_any().downcast_ref::<crate::box_trait::VoidBox>().is_some() {
+                    println!("null"); return Ok(());
+                }
+                if let Some(sb) = bx.as_any().downcast_ref::<crate::box_trait::StringBox>() {
+                    println!("{}", sb.value); return Ok(());
+                }
+            }
+            VMValue::String(s) => { println!("{}", s); return Ok(()); }
+            _ => {}
+        }
         println!("{}", v.to_string());
         Ok(())
     }