{
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    {
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          "evidence-del-valle-map-facility-topology"
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        },
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          "main entrance",
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          "boat inspection station"
        ]
      },
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        {
          "claim_id": "claim-del-valle-map-facility-topology",
          "evidence_id": "evidence-del-valle-map-facility-topology",
          "notes": "",
          "observation_id": "observation-del-valle-map-2026",
          "stance": "supports"
        }
      ],
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        {
          "artifact_refs": [
            "PDF page 1"
          ],
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          "observation_id": "observation-del-valle-map-2026",
          "observed_at": "2026-04-01T00:00:00+00:00",
          "observer": "Wayproof source review",
          "retrieved_at": "2026-09-20T00:00:00+00:00",
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        }
      ],
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        {
          "locator": "https://www.ebparks.org/sites/default/files/del-valle-map.pdf",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-del-valle-map-2026-04"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-del-valle-map-revision-2026-04",
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        },
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        {
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          "observation_id": "observation-del-valle-map-2026",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [
            "PDF page 1"
          ],
          "content": "The map is revised 2026/4 and depicts park entrances, staging, parking counts, trails and mileages, beaches, campground and group sites, picnic areas, visitor center, marina, launch, inspection station, restricted areas, and accessibility symbols.",
          "observation_id": "observation-del-valle-map-2026",
          "observed_at": "2026-04-01T00:00:00+00:00",
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      ],
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  ],
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      "entity_id": "park-del-valle-regional-park",
      "kind": "park",
      "name": "Del Valle Regional Park"
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  ],
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    {
      "action": "ADD",
      "change_set_id": "wp-20260920-del-valle-map-picnic-fishing",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/observations/observation-del-valle-map-2026.json",
      "reason": "Add the April 2026 Del Valle map plus official picnic and fishing evidence, preserving applicability gaps.",
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      "record_type": "observation",
      "summary": "Ingest the April 2026 park map, picnic inventory, and fishing requirements with explicit conflicts and spatial gaps."
    }
  ],
  "navigation": {
    "next_id": "observation-del-valle-map-eagles-view-location",
    "position": 33,
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    {
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}