//! Viewport logical lines (#113, ADR-0017): soft-wrap-joined text plus a
//! per-char map back to viewport cells. This is the buffer-wide *mechanism* a
//! frame-mode consumer needs for URL detection — the regex and `new URL()`
//! validation stay consumer-side (policy). It also serves the a11y screen-reader
//! mirror (#119). The cell-aware assembly lives in `term.rs`, where the cells
//! are; this module is just the returned shape.
/// One soft-wrap-joined logical line touching the viewport.