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_filebox_debug.hako

@@ -0,0 +1,9 @@
+// Debug test for FileBox type checking
+local file
+file = new FileBox()
+print("Created FileBox")
+
+// Try method call
+local result
+result = file.open("test.txt", "w")
+print("Open result: " + result)