Introduce identity model and reconcile upstream imports

Assistant: codex
Assistant-Model: gpt-6-astra
Assistant-Session: 01a070b5-4994-7271-bd8b-7c3dbcedec4b

tests/test_import_reviews.py

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+from types import SimpleNamespace
+import yaml
+
+from info_tech_canon.import_reviews import reviewed_import_cycles
+
+
+def fixture(tmp_path):
+    (tmp_path / "validation").mkdir()
+    (tmp_path / "review.md").write_text("Distinct concept owners reviewed.")
+    edges = [["a", "uses", "b"], ["b", "uses", "a"]]
+    (tmp_path / "validation/model-import-reviews.yaml").write_text(yaml.safe_dump(
+        {"reviews": [{"boundary_review": "review.md", "edges": edges}]}))
+    return [SimpleNamespace(id="a", kind="model", relationships=[{"type": "uses", "target": "b"}]),
+            SimpleNamespace(id="b", kind="model", relationships=[{"type": "uses", "target": "a"}])]
+
+
+def test_exact_review_preserves_reciprocal_imports(tmp_path):
+    artifacts = fixture(tmp_path)
+    assert len(reviewed_import_cycles(artifacts, tmp_path)) == 1
+    assert artifacts[0].relationships == [{"type": "uses", "target": "b"}]
+
+
+def test_new_internal_edge_or_type_is_not_excused(tmp_path):
+    artifacts = fixture(tmp_path)
+    artifacts[0].relationships.append({"type": "defines", "target": "b"})
+    assert reviewed_import_cycles(artifacts, tmp_path) is None
+
+
+def test_new_component_member_is_not_excused(tmp_path):
+    artifacts = fixture(tmp_path)
+    artifacts[0].relationships.append({"type": "uses", "target": "c"})
+    artifacts.append(SimpleNamespace(id="c", kind="model", relationships=[{"type": "uses", "target": "a"}]))
+    assert reviewed_import_cycles(artifacts, tmp_path) is None
+
+
+def test_missing_rationale_is_not_excused(tmp_path):
+    artifacts = fixture(tmp_path)
+    (tmp_path / "review.md").unlink()
+    assert reviewed_import_cycles(artifacts, tmp_path) is None
+
+
+def test_unreviewed_second_cycle_is_not_excused(tmp_path):
+    artifacts = fixture(tmp_path)
+    artifacts.append(SimpleNamespace(id="c", kind="model", relationships=[{"type": "uses", "target": "c"}]))
+    assert reviewed_import_cycles(artifacts, tmp_path) is None