Added deterministic function layer

src/markitect_tool/__init__.py

@@ -20,6 +20,19 @@ from markitect_tool.contract import (
     validate_contract,
     validate_contract_file,
 )
+from markitect_tool.document_function import (
+    DocumentFunctionCall,
+    DocumentFunctionDescriptor,
+    DocumentFunctionError,
+    DocumentFunctionEvaluationResult,
+    DocumentFunctionParameter,
+    DocumentFunctionRegistry,
+    DocumentFunctionRun,
+    default_document_function_registry,
+    parse_document_function_calls,
+    render_document_functions,
+    validate_document_functions,
+)
 from markitect_tool.cache import (
     CacheEntry,
     CacheManifest,
@@ -220,6 +233,17 @@ __all__ = [
     "load_contract_file",
     "validate_contract",
     "validate_contract_file",
+    "DocumentFunctionCall",
+    "DocumentFunctionDescriptor",
+    "DocumentFunctionError",
+    "DocumentFunctionEvaluationResult",
+    "DocumentFunctionParameter",
+    "DocumentFunctionRegistry",
+    "DocumentFunctionRun",
+    "default_document_function_registry",
+    "parse_document_function_calls",
+    "render_document_functions",
+    "validate_document_functions",
     "CacheEntry",
     "CacheManifest",
     "CacheStatus",