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feat(docs): add sample image generator + readme links
Terminal ANSI colors were resolved straight from the palette with no readability adjustment. On the near-white light backgrounds this left the chromatic colors illegible (yellow ~1.6:1, cyan ~1.7:1, green ~2.1:1, ...). The "bright" variants were worse: brightHex always *lightened*, which improves contrast on a dark background but pushes colors toward a light one. Add WCAG contrast utilities (relativeLuminance, contrastRatio, ensureContrast) to colorUtils and apply a 3:1 contrast floor to the chromatic ANSI text colors across all four terminal targets (wezterm, vscode, zed, neovim). ensureContrast nudges only lightness, preserving hue/saturation, and is a no-op when a color already passes -- so dark themes are byte-for-byte unchanged. "Bright" is now direction-aware: lighter on dark backgrounds, darker on light ones. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
fix(terminal): floor ANSI colors to 3:1 contrast on light themes
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