Upload Lance datasets from /tmp/dcd_arxiv_out

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+# Dataset metadata — data lineage and provenance
+
+# --- Identity ---
+name: "dcd_arxiv_out"
+description: >
+  arxiv 解析结果（MinerU）入库后的 PDF+文本+图片 Lance 数据集。
+tags:
+  - "arxiv"
+  - "pdf"
+  - "parse"
+  - "multimodal"
+
+# --- Ownership ---
+owners:
+  - "kuo.y@outlook.com"
+created_at: "2026-04-17"
+updated_at: "2026-04-17"
+
+# --- Source / Lineage ---
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+  platform: arxiv
+  url: "https://arxiv.org"
+  upstream:
+    - name: "arxiv"
+      url: "https://arxiv.org"
+      relationship: derived_from
+      description: "采样自数据数据集 arxiv_20251203。"
+
+# --- Pipeline / Transformation ---
+pipeline:
+  steps:
+    - name: parse
+      description: MinerU离线解析
+      tool: "pdf_parse_2026_mineru25_v1"
+
+# --- Quality ---
+quality:
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