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_simple_arg.hako

@@ -0,0 +1,9 @@
+// Simple test with debug
+local file
+file = new FileBox()
+
+// Check argument count
+print("Calling open with 2 args...")
+local result
+result = file.open("test.txt", "w")
+print("Done!")