Extensible canonical internal processing refactoring

tests/test_builtin_extension_catalog.py

@@ -0,0 +1,50 @@
+from markitect_tool.extension import builtin_extension_registry
+
+
+def test_builtin_extension_registry_lists_query_processors_and_backend():
+    registry = builtin_extension_registry()
+
+    ids = [descriptor.id for descriptor in registry.list()]
+
+    assert "query.selector" not in ids
+    assert "selector" in ids
+    assert "jsonpath" in ids
+    assert "processor.identity" in ids
+    assert "processor.uppercase" in ids
+    assert "processor.include" in ids
+    assert "backend.local-sqlite" in ids
+
+
+def test_builtin_processor_descriptors_capture_safety_and_provenance():
+    registry = builtin_extension_registry()
+
+    include = registry.get("processor.include")
+    uppercase = registry.get("processor.uppercase")
+
+    assert include.kind == "processor"
+    assert include.safety["reads_files"] is True
+    assert include.provenance_prefix == "processor.include"
+    assert uppercase.safety == {}
+    assert uppercase.provenance_prefix == "processor.uppercase"
+
+
+def test_builtin_local_sqlite_descriptor_exposes_backend_capabilities():
+    registry = builtin_extension_registry()
+
+    descriptor = registry.get("backend.local-sqlite")
+
+    assert descriptor.kind == "backend"
+    assert {capability.id for capability in descriptor.capabilities} >= {
+        "snapshots",
+        "ast",
+        "json",
+        "fts",
+        "sql",
+        "provenance",
+    }
+    assert descriptor.cli["commands"] == [
+        "mkt cache init",
+        "mkt cache index",
+        "mkt cache query",
+        "mkt search",
+    ]