chore: import upstream snapshot with attribution

runtime/bootstrap/__init__.py

@@ -0,0 +1 @@
+"""Bootstrap helpers for runtime subsystems."""

runtime/bootstrap/schema.py

@@ -0,0 +1,28 @@
+"""Ensure schema registry is populated with runtime-provided registrations."""
+
+from importlib import import_module
+from typing import Iterable
+
+_BOOTSTRAPPED = False
+
+
+def _modules_to_import() -> Iterable[str]:
+    return (
+        "runtime.node.builtin_nodes",
+        "runtime.node.agent.memory.builtin_stores",
+        "runtime.node.agent.thinking.builtin_thinking",
+        "runtime.edge.conditions.builtin_types",
+        "runtime.node.agent.providers.builtin_providers",
+    )
+
+
+def ensure_schema_registry_populated() -> None:
+    """Import built-in runtime registration modules exactly once."""
+    global _BOOTSTRAPPED
+    if _BOOTSTRAPPED:
+        return
+
+    for module_name in _modules_to_import():
+        import_module(module_name)
+
+    _BOOTSTRAPPED = True