feat(evidence): add table-free v3 and design guidance

harness/tests/test_evidence_authoring.py

@@ -350,12 +350,12 @@ def test_prepare_changed_source_uses_one_model_call_and_applies_a_valid_batch(tm
     assert restructurer.requests[0].previous_units[0].id == "evidence:fascia-pediatrica"
     curated_path = tmp_path / "evidence" / "curated" / "domain" / "fascia-pediatrica.md"
     curated = load_curated_tree(tmp_path / "evidence" / "curated")[0]
-    assert curated.schema_version == 2
+    assert curated.schema_version == 3
     assert "# Fascia pediatrica\n" in curated_path.read_text(encoding="utf-8")
     assert validate_workspace_evidence(tmp_path).publishable is True
 
 
-def test_migrate_workspace_evidence_rewrites_v1_units_without_a_model_call(tmp_path):
+def test_migrate_workspace_evidence_rewrites_v1_units_as_v3_without_a_model_call(tmp_path):
     source_text = "I pazienti sotto i 18 anni sono pediatrici."
     _write_workspace(tmp_path, _evidence(source_text), source_text)
 
@@ -365,7 +365,7 @@ def test_migrate_workspace_evidence_rewrites_v1_units_without_a_model_call(tmp_p
     migrated = load_curated_tree(tmp_path / "evidence" / "curated")[0]
     assert report.migrated == ("evidence:fascia-pediatrica",)
     assert report.unchanged == ()
-    assert migrated.schema_version == 2
+    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",
@@ -373,6 +373,26 @@ def test_migrate_workspace_evidence_rewrites_v1_units_without_a_model_call(tmp_p
     assert report.findings == ()
 
 
+def test_migrate_workspace_evidence_rewrites_v2_units_as_table_free_v3(tmp_path):
+    source_text = "I pazienti sotto i 18 anni sono pediatrici."
+    evidence = _evidence(source_text).model_copy(update={"schema_version": 2})
+    _write_workspace(tmp_path, evidence, source_text)
+
+    first = migrate_workspace_evidence(tmp_path, git_status=lambda _: ())
+    second = migrate_workspace_evidence(tmp_path, git_status=lambda _: ())
+
+    curated_path = tmp_path / "evidence" / "curated" / "domain" / "fascia-pediatrica.md"
+    text = curated_path.read_text(encoding="utf-8")
+    migrated = load_curated_tree(tmp_path / "evidence" / "curated")[0]
+    assert first.migrated == ("evidence:fascia-pediatrica",)
+    assert first.unchanged == ()
+    assert second.migrated == ()
+    assert second.unchanged == ("evidence:fascia-pediatrica",)
+    assert migrated.schema_version == 3
+    assert text.startswith("<!-- tht:metadata:")
+    assert not any(line.startswith("|") for line in text.splitlines())
+
+
 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"
@@ -546,7 +566,7 @@ def test_prepare_marks_an_omitted_prior_unit_for_human_review(tmp_path):
         "supporting_excerpt_missing", "unresolved_review_item",
     ]
     retained = load_curated_tree(tmp_path / "evidence" / "curated")[0]
-    assert retained.schema_version == 2
+    assert retained.schema_version == 3
     assert retained.review_items[0].code == "source_no_longer_supports_unit"