Implement first knowledge engine runtime slice

tests/test_package_contract.py

@@ -1,6 +1,12 @@
-from kontextual_engine import __version__
+from kontextual_engine import Artifact, Collection, InMemoryKnowledgeRepository, __version__
 
 
 def test_package_exports_version() -> None:
     assert __version__ == "0.1.0"
 
+
+def test_package_exports_core_runtime_contracts() -> None:
+    repo = InMemoryKnowledgeRepository()
+    collection = repo.save_collection(Collection.create("export-check"))
+    artifact = repo.save_artifact(Artifact.create(collection.id, "note", "content"))
+    assert repo.get_artifact(artifact.id).name == "note"