OptionalAuthor'agent' when the helper claimed the whole batch was caused by an agent command (batches
are single-author); absent means the user. A CLAIM — the board applies its own gate.
The widget's board item ID (e.g. html-2).
Compact human summary of the batch (≤WHITEBOARD_INTERACTION_SUMMARY_MAX_CHARS chars).
The widget's header title ('' when untitled — consumers fall back to ItemID).
One accepted ambient-interaction batch, surfaced by the board/host
WidgetInteractionoutput.Summaryis the compact human line built by SummarizeWidgetInteractions — what integration layers forward to their agent runtime.