Table row — accessibility

Keyboard

The row stays a <tr>: a screen that wants keyboard operation opts in (rowKeyboard), which adds tabIndex=0 plus Enter and Space, rather than turning the row into a button and losing the table semantics.
The checkbox inside td.col-ck is a real input, so Space toggles it; the cell stops the click from bubbling to the row, so picking never opens the record by accident.
A .cell-link is a real button or link and is reached by Tab like any other control.

Every cell is announced with its column header, because the header cells are <th>.
The row checkbox is labelled by the record it selects.
The avatar in the identity cell is decorative; the name carries the meaning.
A clipped name keeps its full text in title, which assistive technology reads as the description.

Rows and cell controls take the foundation ring from ds.css.
The checkbox draws its ring on the visible box, because the real input is visually hidden.
The identity and checkbox columns are frozen, so a focused row keeps its context while the table scrolls sideways.

Computed from packages/ui/src/tokens/tokens.css:

Cell text in ink — above AA in both themes.
.cell-mono uses tabular figures in the same ink; it is not a different colour.
Hover fill --hover-surface and selected fill --selected are tints; the checkbox is the real carrier of the selection.
.cell-link uses --accent = 4.44:1 light, 3.83:1 dark.

Selection is visible as a fill plus the checkbox; for a colour-blind user the checkbox is the only reliable signal, which is why it stays visible once picked.
A clipped value needs a hover (or assistive technology) to be read in full.
The row has no disabled state; a record that cannot be opened has to be left out or handled by the screen.