- delegate_to_* now receives a trimmed conversation history (last ~6
turns, 500 chars/turn) as context on both live direct-delegation
paths (streaming and steward non-streaming), via new
build_delegation_context helper
- _stream_direct_delegation restructured as an async generator: the
butler 'start' think message streams BEFORE the expert runs and the
success/error message right after it finishes, instead of all
messages arriving after the research completed
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
