digital-read D4, criterion 7 - the alignment instrument the adoption was motivated by. RenderMode.two_pane (F8, or the two-pane harness) reveals a left-edge column rendering the agent frame's text for the same tick - spine plus every read sentence with its class and anchor - beside the unchanged live visual and rail, so the parity between how the agent reads a tick and how it looks is diffable in one frame. Debug-only: off by default, outside frames-not-dumps. The day number shares the rail's formula so the panes cannot disagree. Scope honesty: this is the criterion's explicitly permitted 'pair the agent frame's text'; the fuller dual-visual-dialect split is deferred because the 2D camera couples the UI rail with the flat world, so a clean viewport split needs a UI-camera separation (queued). Defense: wiki/interface/digital-read.md criterion 7, amended here with the D4 note. No sim or save change; the pane reads existing projections.