fix: harden model catalog projections

harness/tests/test_corpus_models.py

@@ -40,6 +40,7 @@ def test_manifest_contains_provenance_without_credentials():
         manifest_id="manifest:abc",
         created_at=datetime(2026, 7, 12, tzinfo=UTC),
         pipeline_version="evidence-v1",
+        embedding_id="ollama/nomic-embed-text",
         embedding_model="nomic-embed-text",
         embedding_dimensions=768,
         documents=[document()],
@@ -52,6 +53,7 @@ def test_manifest_contains_provenance_without_credentials():
     assert "etag:abc" in payload
     assert "evidence-v1" in payload
     assert "nomic-embed-text" in payload
+    assert '"embedding_id":"ollama/nomic-embed-text"' in payload
     assert "api_key" not in payload
 
 
@@ -93,6 +95,25 @@ def test_manifest_validates_embedding_compatibility_fields():
         )
 
 
+def test_schema_v1_manifest_without_canonical_embedding_id_remains_readable():
+    manifest = CorpusManifest.model_validate({
+        "schema_version": 1,
+        "embedding_model": "legacy-model",
+        "embedding_dimensions": 768,
+    })
+
+    assert manifest.embedding_id is None
+
+
+def test_schema_v2_embedding_generation_requires_canonical_id():
+    with pytest.raises(ValidationError, match="embedding_id"):
+        CorpusManifest(
+            schema_version=2,
+            embedding_model="model-v2",
+            embedding_dimensions=768,
+        )
+
+
 def test_canonical_metadata_rejects_secrets_and_non_json_values():
     with pytest.raises(ValidationError, match="credential-like"):
         CanonicalDocument.model_validate(