phase: 20.49 COMPLETE; 20.50 Flow+String minimal reps; 20.51 selfhost v0/v1 minimal (Option A/B); hv1-inline binop/unop/copy; docs + run_all + CURRENT_TASK -> 21.0

examples/semantics_test_extern.hako

@@ -0,0 +1,8 @@
+// Semantics test - ExternCall (console.log)
+
+static box Main {
+    main() {
+        print("Hello from semantics test!")
+        return 42
+    }
+}