//! [`FacetSpec`]: a UI-toolkit-agnostic row of GemCAD-style cutting
//! instructions.
/// A single row of GemCAD-style cutting instructions: one facet's angle, index
/// position(s), and any notes.
///
/// Exactly as scraped/stored (plain strings, no numeric parsing done yet -- see
/// `parse_angle_deg` / `parse_girdle_facet_count` below for the lenient parsing of
/// these fields).
///
/// This is a plain, UI-toolkit-agnostic type so that callers (e.g. a Slint-based
/// viewer) can convert their own generated row type into this one at the call
/// site, keeping this crate free of any UI dependency.