One absolutely-addressed line per row, each closed with an erase-to-end, so
nothing scrolls and a repaint cannot leave the previous frame's tail behind.
The caller wraps the result in synchronized-output brackets; that is an IO
decision and stays out of the renderer.
Color is passed in rather than detected. chalk's detection is right for the
one-shot CLI but would make a frame non-deterministic, so the palette is raw
SGR in the same semantic roles cli-style uses, and `color: false` emits nothing
but the cursor addressing, the session's own colors in the preview included.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
