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With nothing selected and no ids, set_paint changes only the paint for
new art, but its reply was the same as when it painted objects, so a
caller could not tell that no object changed.
paint.setFill, paint.setStroke, paint.none, paint.lastColor,
paint.lastGradient and stroke.set now reply {objects}: how many objects
took the paint, as the commands resolve their targets (a selected group
counts the objects inside it). set_paint adds the largest of those
counts to its reply as `objects`, and when it is 0 a `note` says that
only the paint for new art changed. The tool description and the
set_paint row in docs/mcp.md describe the reply.