{
  "id": "retention-cycle",
  "visual_grammar": "timeline",
  "reader_question": "기준일과 현재·다음 로테이션의 시간 간격은 어떻게 되는가?",
  "diagram_only": true,
  "visible_text_scope": [
    "node labels",
    "boundary labels",
    "edge labels",
    "state/time annotations required to decode the relation"
  ],
  "forbidden_visible_elements": [
    "global title",
    "subtitle paragraph",
    "footer",
    "takeaway band",
    "pattern number",
    "generator watermark",
    "decorative metric card",
    "gradient",
    "drop shadow",
    "glow"
  ],
  "palette_policy": "grayscale plus one primary accent; status colors only when semantic",
  "required_renderer_capabilities": [
    "time axis",
    "dated markers",
    "period bracket"
  ]
}