Enrichment grid

A table a model fills in, one cell at a time. Source columns sit beside AI columns, and every AI cell shows where it stands: waiting, running, its answer, or why it failed. Each AI column's header carries the one action it needs now: Run for rows that have not run, a progress bar while they do, then Retry for the rows that failed. Virtualized for thousands of rows, with arrow-key navigation and copy. Reads cells from the data parts an AI SDK route streams.