feat: add structured expectation fixtures for three audited papers with annotated pages

tests/fixtures/ocr_real_papers/A8E7SRVS/expectations.json

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+{
+  "pages": {
+    "5": {
+      "expected_object_ownership": [
+        {"object_type": "figure", "figure_number": 1, "must_render_as_object": true},
+        {"object_type": "figure", "figure_number": 2, "must_render_as_object": true},
+        {"object_type": "figure", "figure_number": 3, "must_render_as_object": true},
+        {"object_type": "figure", "figure_number": 4, "must_render_as_object": true}
+      ],
+      "expected_render_invariants": [
+        {"type": "not_in_body", "text_contains": "Fig. 1"}
+      ]
+    },
+    "6": {
+      "expected_consumption": [
+        {"block_id_comment": "Fig.5 continuation sentence", "consumed_by_kind": "figure", "consumed_by_number": 5, "must_not_render_as_body": true}
+      ]
+    },
+    "7": {
+      "expected_object_ownership": [
+        {"object_type": "table", "table_number": 3, "must_render_as_object": true, "must_not_split_by_body_blocks": true}
+      ]
+    },
+    "12": {
+      "expected_render_invariants": [
+        {"type": "before_text", "before": "Conclusion", "after": "References", "layer": "render_order_markdown"}
+      ]
+    }
+  }
+}

tests/fixtures/ocr_real_papers/CAQNW9Q2/expectations.json

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+{
+  "document": {
+    "expected_reader_figure_count_min": 2,
+    "expected_reference_zone": true,
+    "expected_abstract_span": true
+  },
+  "pages": {
+    "1": {
+      "expected_roles": [
+        {"block_pattern": "Quantitative radiography", "role": "title_or_doc_title", "confidence": "medium"}
+      ],
+      "expected_non_body": [0, 1, 4, 5],
+      "expected_reference_rules": [
+        {"block_id_comment": "no block on page 1 should be reference_item"}
+      ]
+    },
+    "7": {
+      "expected_order_relations": [
+        {"before_text": "Conclusion", "after_text": "References", "layer": "render_order_markdown"}
+      ],
+      "expected_reference_rules": [
+        {"must_not_render_references_as_body": true}
+      ]
+    }
+  }
+}

tests/fixtures/ocr_real_papers/DWQQK2YB/expectations.json

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+{
+  "document": {
+    "expected_reader_figure_count_min": 3,
+    "expected_reference_zone": true,
+    "expected_abstract_span": true
+  },
+  "pages": {
+    "35": {
+      "expected_object_ownership": [
+        {
+          "object_type": "figure",
+          "figure_number": 1,
+          "must_render_as_object": true,
+          "must_not_render_caption_blocks_as_body": true
+        }
+      ]
+    }
+  },
+  "expected_render_invariants": [
+    {"type": "no_duplicate_caption", "caption_regex": "Fig\\.\\s*1"}
+  ]
+}