fix(evidence): index only curated legacy documents

harness/tests/test_evidence_facade_contract.py

@@ -117,6 +117,25 @@ def test_source_factory_preserves_legacy_first_order_and_filesystem_configuratio
     assert current[1].max_bytes == 1024
 
 
+def test_legacy_source_discovers_only_curated_evidence_units(tmp_path):
+    legacy_root = tmp_path / "legacy"
+    (legacy_root / "evidence" / "source").mkdir(parents=True)
+    (legacy_root / "evidence" / "source" / "raw.md").write_text("raw source")
+    (legacy_root / "evidence" / "curated" / "domain").mkdir(parents=True)
+    (legacy_root / "evidence" / "curated" / "domain" / "patient.md").write_text("curated")
+    cfg = SimpleNamespace(evidence=SimpleNamespace(
+        source_root=legacy_root,
+        evidence_dir="evidence",
+        sources=[],
+    ))
+
+    source = build_sources(cfg.evidence)[0]
+
+    assert [item.metadata["relative_path"] for item in source.discover()] == [
+        "curated/domain/patient.md"
+    ]
+
+
 def test_preprocessing_factory_forwards_only_evidence_pipeline_dependencies(monkeypatch):
     captured = {}