test: lock OCR phase5 evidence object contract

tests/test_ocr_evidence.py

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+from __future__ import annotations
+
+
+def test_evidence_object_preserves_role_page_confidence_and_asset() -> None:
+    from paperforge.worker.ocr_evidence import build_evidence_hit
+
+    hit = build_evidence_hit(
+        paper_id="KEY001",
+        role="figure_caption",
+        page=7,
+        block_id="p7_b18",
+        text="Figure 3. Results.",
+        asset_path="render/figures/figure_003.md",
+        confidence=0.84,
+        verification="has_page_crop",
+    )
+
+    assert hit["source_type"] == "figure_caption"
+    assert hit["page"] == 7
+    assert hit["asset"] == "render/figures/figure_003.md"
+    assert hit["confidence"] == 0.84

tests/test_paper_context_evidence.py

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+from __future__ import annotations
+
+
+def test_paper_context_includes_evidence_summary() -> None:
+    from paperforge.worker.ocr_evidence import build_paper_evidence_summary
+
+    summary = build_paper_evidence_summary(
+        paper_id="KEY001",
+        role_indexes={
+            "body": [{"role": "body_paragraph", "text": "Text..."}],
+            "captions": [{"role": "figure_caption", "text": "Figure 1."}],
+            "references": [{"role": "reference_item", "text": "Smith 2024."}],
+            "metadata": [{"role": "metadata_title", "text": "Paper Title"}],
+            "tables": [],
+        },
+    )
+
+    assert "total_evidence_blocks" in summary
+    assert summary["total_evidence_blocks"] == 4
+    assert "by_role" in summary
+    assert summary["by_role"]["body"] == 1
+    assert summary["by_role"]["captions"] == 1
+    assert "has_figures" in summary or "has_tables" in summary