Module diff 

Diff rendering for tool results — colored +/-/ lines with intra-line word-diff highlighting.

Port of the TypeScript renderDiff (packages/coding-agent/.../components/diff.ts).

The edit tool already produces a display-oriented diff string in result.details.diff (lines shaped +123 … / -123 … / 123 …; see rpi-tools/src/tools/edit_diff.rs::generate_diff_string). This module consumes that string (no generator, no rpi-tools dependency) and renders it as ANSI-styled terminal lines:

• removed (-) → red (theme.colors.error)
• added (+) → green (theme.colors.success)
• context ( ) → muted/dim (theme.colors.muted)
• for a single removed→added pair, the changed words are inverse-highlighted so you can see what moved within the line.

Functions

render_diff

Render a display-diff string into styled terminal lines.