Feat: WIP terse code documentation

crates/ratatui/src/section_header.rs

@@ -1,3 +1,5 @@
+//! Section header with horizontal divider for engine-view panels.
+
 use ratatui::layout::{Constraint, Layout, Rect};
 use ratatui::style::{Modifier, Style};
 use ratatui::widgets::Paragraph;
@@ -5,6 +7,7 @@ use ratatui::Frame;
 
 use crate::theme;
 
+/// Render a section title with a horizontal divider below it.
 pub fn render_section_header(frame: &mut Frame, title: &str, focused: bool, area: Rect) {
     let theme = theme::get();
     let [header_area, divider_area] =