{
  "version": "1.1",
  "id": "timeline",
  "title": "timeline runtime fixture",
  "question": "Does the timeline logical composition render correctly?",
  "type": "concept",
  "direction": "LR",
  "audience": [
    "renderer maintainer"
  ],
  "summary": "Executable timeline fixture.",
  "alt": "Executable technical diagram fixture for the timeline composition profile.",
  "long_description": "This fixture validates the node roles, edges, and layout rules of the timeline profile.",
  "source_context": {
    "document": "examples/runtime-profiles/fixture.md",
    "document_sha256": "0000000000000000000000000000000000000000000000000000000000000000",
    "anchor": {
      "kind": "line",
      "value": 1,
      "line": 1
    }
  },
  "composition": {
    "profile": "timeline",
    "diagram_only": true,
    "reference_ids": [
      "retention-cycle"
    ],
    "rationale": "Runtime regression fixture for timeline.",
    "focus_node": "today"
  },
  "groups": [],
  "nodes": [
    {
      "id": "t0",
      "label": "T = 0",
      "kind": "milestone",
      "role": "milestone",
      "evidence": [
        {
          "start_line": 1,
          "end_line": 1
        }
      ],
      "assumption": false,
      "position": 1,
      "details": [
        "1970-01-01",
        "Unix Epoch"
      ]
    },
    {
      "id": "d372",
      "label": "+372d",
      "kind": "milestone",
      "role": "milestone",
      "evidence": [
        {
          "start_line": 1,
          "end_line": 1
        }
      ],
      "assumption": false,
      "position": 2,
      "details": [
        "1971-01-08"
      ]
    },
    {
      "id": "d744",
      "label": "+744d",
      "kind": "milestone",
      "role": "milestone",
      "evidence": [
        {
          "start_line": 1,
          "end_line": 1
        }
      ],
      "assumption": false,
      "position": 3,
      "details": [
        "1972-01-15"
      ]
    },
    {
      "id": "n55",
      "label": "n=55",
      "kind": "milestone",
      "role": "milestone",
      "evidence": [
        {
          "start_line": 1,
          "end_line": 1
        }
      ],
      "assumption": false,
      "position": 4,
      "emphasis": "warning",
      "details": [
        "2026-01-07",
        "직전 로테이션"
      ]
    },
    {
      "id": "today",
      "label": "현재",
      "kind": "milestone",
      "role": "milestone",
      "evidence": [
        {
          "start_line": 1,
          "end_line": 1
        }
      ],
      "assumption": false,
      "position": 5,
      "emphasis": "primary",
      "details": [
        "오늘"
      ]
    },
    {
      "id": "n56",
      "label": "n=56",
      "kind": "milestone",
      "role": "milestone",
      "evidence": [
        {
          "start_line": 1,
          "end_line": 1
        }
      ],
      "assumption": false,
      "position": 6,
      "details": [
        "2027-01-14",
        "다음 로테이션"
      ]
    }
  ],
  "edges": [],
  "legend": [],
  "metadata": {
    "fixture": true
  }
}