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  "coverage": {
    "checked": "2026-10-17",
    "gaps": [
      "Platform interior remains undrawn.",
      "Museum route ends on river-side public path, not at the museum gate; road crossing and admission access not mapped.",
      "Bach Dang destination is a public promenade node, not the waterbus boarding platform.",
      "Ba Son pier approach remains about 81m from the mapped platform; no boarding path or ferry service invented."
    ]
  }
}