Add render export adapter contract

tests/test_builtin_extension_catalog.py

@@ -24,6 +24,8 @@ def test_builtin_extension_registry_lists_query_processors_and_backend():
     assert "memory.graph-contract" in ids
     assert "memory.runtime-adapter-boundary" in ids
     assert "memory.context-package" in ids
+    assert "render.export-registry" in ids
+    assert "render.fake" in ids
     assert "source.adapter-registry" in ids
 
 
@@ -182,3 +184,18 @@ def test_builtin_memory_graph_descriptor_exposes_runtime_handoff_boundaries():
     assert adapters.safety["runtime_execution"] is False
     assert adapters.metadata["services_launched_by_markitect_tool"] is False
     assert "examples/memory/runtime-adapter-boundaries.yaml" in adapters.examples
+
+
+def test_builtin_render_export_descriptors_expose_contract_boundary():
+    registry = builtin_extension_registry()
+
+    registry_descriptor = registry.get("render.export-registry")
+    fake = registry.get("render.fake")
+
+    assert registry_descriptor.kind == "render-export-registry"
+    assert registry_descriptor.safety["external_process"] is False
+    assert registry_descriptor.metadata["concrete_renderer_execution_required"] is False
+    assert fake.kind == "render-export"
+    assert fake.safety["external_process"] is False
+    assert fake.safety["filesystem_write"] is False
+    assert fake.metadata["render_export_adapter"]["metadata"]["quarkdown_dependency"] is False