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    "time_span": {
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      "layer_name_en": "Textual Layer — Classical Sources",
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      "layer_name_en": "Place Layer — Field Anchors",
      "layer_type": "PLACE",
      "description": "v0.4 10 place entities,所有 GPS 仅为 placeholder。",
      "color_hint": "var(--archival-brown)",
      "events": [
        {
          "event_id": "evt-place-001",
          "date_label": "实地",
          "date_year": 2026,
          "title": "桑干河 (张家口)",
          "description": "FN-20260928-001 · 河床干涸"
        },
        {
          "event_id": "evt-place-002",
          "date_label": "实地",
          "date_year": 2026,
          "title": "北京 (故宫)",
          "description": "FN-20260928-002 · 柱径 d=2c 已核实"
        },
        {
          "event_id": "evt-place-003",
          "date_label": "实地",
          "date_year": 2026,
          "title": "北京 (颐和园)",
          "description": "FN-20260928-003 · 柱径比例与宫殿不同"
        },
        {
          "event_id": "evt-place-004",
          "date_label": "实地",
          "date_year": 2026,
          "title": "运河 (通州)",
          "description": "FN-20260928-004 · 大运河通州段仍可通航"
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      "layer_name_en": "Collection Layer — Thematic Curation",
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          "description": "水经注河水分布研究"
        },
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          "date_label": "v0.5",
          "date_year": 2026,
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          "description": "工程做法柱径标准"
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        {
          "event_id": "evt-coll-005",
          "date_label": "v0.5",
          "date_year": 2026,
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