fix: support dict and list[dict] as predictor input types (#2928)
* fix: support dict and list[dict] as predictor input types
dict, Dict[str, Any], list[dict], and List[Dict[str, Any]] were not
supported as predictor input types, even though they worked as output
types. This broke models using chat-style messages: list[dict] inputs.
The fix maps dict types to ANY (opaque JSON objects) in both the Go
tree-sitter schema generator (ResolveFieldType) and the Python SDK
runtime (FieldType.from_type), handling all variants: bare dict,
parameterized Dict[K,V], list[dict], Optional[dict], and PEP 604
union syntax.
* fix: correct JSON key ordering in integration test schema assertions
The OpenAPI schema serializes property keys in sorted order (items,
title, type, x-order), not insertion order. Fix the stdout assertions
to match the actual key ordering.
