AxEventPathRoot
type AxEventPathRoot =
| "constant"
| "correlation"
| "data"
| "envelope"
| "extensions"
| "identity"
| "trust"
| "continuation";Defined in: https://github.com/ax-llm/ax/blob/e4219a44b7581a55a40d9dd62d2c281062ff078d/src/ax/event/types.ts#L258