Enum CellAttrs
Visual attributes a Cell can carry alongside its foreground / background colors. Maps to a small subset of SGR attributes that matter for retro UI work — bold for emphasis, underline for hyperlinks / focused fields. Italic / strikethrough can be added later if a real consumer needs them.
[Flags]
public enum CellAttrs : byte
Fields
None = 0Bold = 1Underline = 2