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Adds 22 unit tests in test/terminal/painter_test.dart covering the constructor, the three reactive setters (textStyle, textScaler, theme — both same-value early-return and different-value paths), clearFontCache, paintCursor for all three cursor types plus the no-focus stroked-rect branch, paintHighlight, paintLine end-to-end, paintCellForeground (codepoint-0 short-circuit, faint, inverse, underline-on-space, bold+italic, cache hit), paintCellBackground (normal early-return, inverse, named/palette, double-width), and the foreground / background colour resolvers across normal / named / palette / rgb colour types. Coverage: painter.dart 72/120 -> 120/121. Total 70.30% -> 70.86%. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>