* fix(tui): improve colour contrast for light-background terminals (#38636)
Detect light terminal backgrounds via COLORFGBG and apply a WCAG
AA-compliant light palette. Adds OPENCLAW_THEME=light|dark env var
override for terminals without auto-detection.
Uses proper sRGB linearisation and WCAG 2.1 contrast ratios to pick
whichever text palette (dark or light) has higher contrast against
the detected background colour.
Co-authored-by: ademczuk <ademczuk@users.noreply.github.com>
* Update CHANGELOG.md
---------
Co-authored-by: ademczuk <andrew.demczuk@gmail.com>
Co-authored-by: ademczuk <ademczuk@users.noreply.github.com>
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