The Anthropic SDK's streaming accumulator builds ParsedMessage snapshots
whose ParsedTextBlock content doesn't match the generic union pydantic
expects, so model_dump() on stream events (message_stop) emits
PydanticSerializationUnexpectedValue UserWarnings straight into the
user's CLI output mid-response.
Pass warnings=False at every helper that dumps arbitrary SDK models
(relay_llm/_jsonable, relay_tools/_jsonable, anthropic_adapter
_to_plain_data, run_agent _hook_jsonable, chat_completion_helpers
extra_content/reasoning_details sites, chat_completions transport),
with a TypeError fallback for duck-typed model_dump implementations.
Adds regression tests including a precondition test that proves the
fixture still trips the warning without suppression.
ceebb21dd7