Paused runs with union-typed user input now save and resume

Agno's UserInputField.to_dict() now writes a requires_user_input parameter typed as a PEP 604 union, such as quantity: int | None, as the string "int | None". The method used to read the type's __name__, which a union lacks, and it runs while Agno saves a paused run, so the save is what broke.

The old failure was quiet. The run paused and the caller got a normal RunOutput with status paused. The database write raised, Agno logged a warning, and the run never reached the runs table, so resuming by ID raised RunNotFoundError.

We ran the same script on both releases with a SQLite database and a scripted stand-in model, copied from the release's own test, that calls the tool once and then replies:

@tool(requires_user_input=True, user_input_fields=["quantity"])
def place_order(item: str, quantity: int | None = None) -> str:
    return f"Ordered {quantity} x {item}"
 
agent = Agent(
    model=ScriptedModel(...),  # stand-in: calls place_order(item="widget"), then says "Order placed."
    tools=[place_order],
    db=SqliteDb(db_file="orders.db"),
)
paused = agent.run("Order a widget.", session_id="orders")
# The caller fills quantity = 3 on paused.active_requirements, then resumes by ID
resumed = agent.continue_run(run_id=paused.run_id, session_id="orders", requirements=paused.requirements)

# Before (real output)
WARNING Error upserting run into db: 'types.UnionType' object has no attribute '__name__'
status: RunStatus.paused
saved in db: False
RunNotFoundError: No runs found for run ID c07d5283-2a5f-4de2-bab4-666bb613058b
 
# Now (real output)
status: RunStatus.paused
saved in db: True
resumed: RunStatus.completed | Ordered 3 x widget | Order placed.

The string fallback also changes the field_type label for parameterized types. A list[str] parameter now reads "list[str]" and Optional[int] reads "typing.Optional[int]". The label is descriptive only, and the resumed tool call takes the value the caller supplied.

See the cookbook, and learn more about UserInputField in the documentation.