* Add Workflow.reset() public method as recovery escape hatch when an
in-flight run aborted (e.g. WorkflowConvergenceException) and the
workflow is not checkpointed. Update the in-flight messages guard's
error message to point callers at it.
* Add test_workflow_run_inflight_messages_guard exercising both the
guard (sync + streaming) and the reset() recovery path.
* Add test_workflow_reset_rejects_concurrent_runs to lock down the
in-progress guard on reset.
* Add test_as_agent_continuation_preserves_prior_state covering the
is_continuation branch in _ensure_state_initialized: stamps a marker
between calls and asserts it survives, while Inputs.input and
System.LastMessageText refresh to the new turn.
* Add test_powerfx_safe.py regression tests for the Enum branch in
_make_powerfx_safe (str-subclass, int-subclass, plain Enum, and
Enums nested in dict/list).
* Drop redundant @pytest.mark.asyncio on
test_as_agent_round_trip_with_last_message_text (asyncio_mode='auto').
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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