With the insertion point in a table cell or a note, data.placeholder.add
with an image field returned "a hyperlink field can't go in a table cell
or a note". It now returns a message about image fields that names the
two ways on: bind the field to a frame, or pass role text to merge its
path. Nothing is inserted on the error, and role text still puts the
marker in the cell.
Docs: docs/agents.md and the command's params text.
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