runner: introduce CoreExecutor box for JSON→exec; wire Gate‑C pipe to CoreExecutor. Stage‑B bundling: duplicate name Fail‑Fast + mix canary; add Core Map/String positive smokes; add Gate‑C budget opt‑in canary; docs: Exit Code Policy; apply child_env in PyVM common util.

src/backend/mir_interpreter/handlers/calls.rs

@@ -134,6 +134,21 @@ impl MirInterpreter {
             other => other.to_string(),
         };
 
+        // Minimal builtin bridge: support print-like globals in legacy form
+        // Accept: "print", "nyash.console.log", "env.console.log", "nyash.builtin.print"
+        match raw.as_str() {
+            "print" | "nyash.console.log" | "env.console.log" | "nyash.builtin.print" => {
+                if let Some(a0) = args.get(0) {
+                    let v = self.reg_load(*a0)?;
+                    println!("{}", v.to_string());
+                } else {
+                    println!("");
+                }
+                return Ok(VMValue::Void);
+            }
+            _ => {}
+        }
+
         // Resolve function name using unique-tail matching
         let fname = call_resolution::resolve_function_name(
             &raw,
@@ -539,6 +554,16 @@ impl MirInterpreter {
         args: &[ValueId],
     ) -> Result<VMValue, VMError> {
         match extern_name {
+            // Minimal console externs
+            "nyash.console.log" | "env.console.log" | "print" | "nyash.builtin.print" => {
+                if let Some(arg_id) = args.get(0) {
+                    let v = self.reg_load(*arg_id)?;
+                    println!("{}", v.to_string());
+                } else {
+                    println!("");
+                }
+                Ok(VMValue::Void)
+            }
             "exit" => {
                 let code = if let Some(arg_id) = args.get(0) {
                     self.reg_load(*arg_id)?.as_integer().unwrap_or(0)