Function wrap_optimal 

pub fn wrap_optimal(text: &str, width: usize) -> KpBreakResult

Compute optimal line breaks using Knuth-Plass DP.

Given a paragraph of text and a target width, finds the set of line breaks that minimizes total badness (cubic slack penalty).

Falls back to greedy word-wrap if the DP cost is prohibitive (very long paragraphs), controlled by max_words.

Arguments

• text - The paragraph to wrap (no embedded newlines expected).
• width - Target line width in cells.

Returns

KpBreakResult with optimal lines, total cost, and per-line badness.