{
  "scope": "Test double compatibility only; no production edits.",
  "changes": "Add current debounce state, controllable System.GetTickCount, and fourth ShowCustom quiet flag (same API as test_hint_delivery). All ownership test cases and assertions unchanged.",
  "limits": "Baseline fails compilation, not a demonstrated production regression. Proposal actual-method harness passes; no native run. Existing hint_delivery owns debounce behavioral coverage."
}