CLI and API polish

tests/test_builtin_extension_catalog.py

@@ -12,6 +12,8 @@ def test_builtin_extension_registry_lists_query_processors_and_backend():
     assert "processor.identity" in ids
     assert "processor.uppercase" in ids
     assert "processor.include" in ids
+    assert "extension.catalog" in ids
+    assert "docs.generated-reference" in ids
     assert "backend.local-sqlite" in ids
     assert "workflow.markdown-dataflow" in ids
     assert "runtime.context" in ids
@@ -22,6 +24,19 @@ def test_builtin_extension_registry_lists_query_processors_and_backend():
     assert "memory.context-package" in ids
 
 
+def test_builtin_meta_descriptors_expose_extension_and_docs_accesspoints():
+    registry = builtin_extension_registry()
+
+    extension = registry.get("extension.catalog")
+    docs = registry.get("docs.generated-reference")
+
+    assert extension.kind == "extension-registry"
+    assert "mkt extension commands" in extension.cli["commands"]
+    assert docs.kind == "documentation"
+    assert docs.safety["writes_files"] is True
+    assert docs.cli["commands"] == ["mkt docs cli", "mkt docs api"]
+
+
 def test_builtin_processor_descriptors_capture_safety_and_provenance():
     registry = builtin_extension_registry()