feat(evidence): structure v3 domain rules for review

harness/tests/test_evidence_authoring.py

@@ -367,9 +367,9 @@ def test_migrate_workspace_evidence_rewrites_v1_units_as_v3_without_a_model_call
     assert report.unchanged == ()
     assert migrated.schema_version == 3
     assert migrated.payload.rule == "La fascia pediatrica comprende i minori."
-    assert "## Regola\n\nLa fascia pediatrica comprende i minori." in curated_path.read_text(
-        encoding="utf-8",
-    )
+    text = curated_path.read_text(encoding="utf-8")
+    assert "## Regola\n\n<!-- tht:raw-rule:" in text
+    assert "La fascia pediatrica comprende i minori." in text
     assert report.findings == ()
 
 
@@ -393,6 +393,41 @@ def test_migrate_workspace_evidence_rewrites_v2_units_as_table_free_v3(tmp_path)
     assert not any(line.startswith("|") for line in text.splitlines())
 
 
+def test_migrate_workspace_evidence_rewrites_legacy_v3_rule_presentation(tmp_path):
+    source_text = "I pazienti sotto i 18 anni sono pediatrici."
+    evidence = _evidence(source_text).model_copy(update={"schema_version": 3})
+    _write_workspace(tmp_path, evidence, source_text)
+    curated_path = tmp_path / "evidence" / "curated" / "domain" / "fascia-pediatrica.md"
+    legacy_text = curated_path.read_text(encoding="utf-8")
+    legacy_text = legacy_text.replace(
+        "## Regola\n\n<!-- tht:raw-rule:",
+        "## Regola\n\n<!-- tht:legacy-raw-rule:",
+        1,
+    )
+    # Recreate the exact pre-structured v3 body from the canonical value.
+    start = legacy_text.index("<!-- tht:field:rule -->")
+    end = legacy_text.index("<!-- /tht:field:rule -->", start)
+    legacy_rule = (
+        "<!-- tht:field:rule -->\n"
+        "## Regola\n\n"
+        f"{evidence.payload.rule}\n"
+    )
+    curated_path.write_text(
+        legacy_text[:start] + legacy_rule + legacy_text[end:],
+        encoding="utf-8",
+    )
+
+    report = migrate_workspace_evidence(tmp_path, git_status=lambda _: ())
+
+    migrated_text = curated_path.read_text(encoding="utf-8")
+    assert report.migrated == ("evidence:fascia-pediatrica",)
+    assert report.unchanged == ()
+    assert "## Regola\n\n<!-- tht:raw-rule:" in migrated_text
+    assert load_curated_tree(tmp_path / "evidence" / "curated")[0].payload.rule == (
+        evidence.payload.rule
+    )
+
+
 def test_migrate_workspace_evidence_rejects_dirty_curated_files_in_a_nested_workspace(tmp_path):
     subprocess.run(["git", "init", "--quiet", str(tmp_path)], check=True)
     workspace_root = tmp_path / "psd-clinical"