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

apps/macros/examples/invalid_json_macro.hako

@@ -0,0 +1,8 @@
+// invalid_json_macro.hako
+// Macro that returns invalid JSON (for strict error test)
+
+static box MacroBoxSpec {
+  expand(json) {
+    return "NOT_JSON!"
+  }
+}