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/test_wasm_simple.hako

@@ -0,0 +1,9 @@
+# Simple WASM ExternCall test - for manual MIR injection
+static box Main {
+    init { result }
+    
+    main() {
+        me.result = "WASM test ready"
+        return me.result
+    }
+}