Add soft colorKey, feather, and dark-pixel protect - #10
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Street-fill knockouts need a distance fade and a short alpha blur so hole edges are not stair-stepped, while dark label pixels stay opaque.
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Summary
colorKeycan fade keyed pixels by color distance (soft) instead of a hard cut.featherblurs alpha after the punch;protectDarkerThanrestores partial-alpha dark pixels so street names stay opaque.Test plan
./vendor/bin/phpunit tests/ColorKeyOpTest.php(25 tests)v2.4.0after merge so Packagist picks it up