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

local_tests/mir_static_main_arithmetic.hako

@@ -0,0 +1,12 @@
+// Test case for static Main arithmetic in MIR
+static box Main {
+    init { }
+    
+    main() {
+        local a, b, result
+        a = 10
+        b = 32
+        result = a + b
+        return result
+    }
+}