feat: Grayscale bit-packed フォーマット (1/2/4 MSB/LSB) を追加#311
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- index8_toStraight を削除し、Index8 Descriptor に grayscale8_toStraight を直接設定 - index8_fromStraight を grayscale8_fromStraight への委譲ラッパーに変更 - grayscale8_fromStraight を4ピクセルループ展開版に最適化 - indexN_toStraight の委譲先を grayscale8_toStraight に変更
grayscale8.h を grayscale.h にリネームし、Grayscale1/2/4 MSB/LSB の 6フォーマットを追加。bit_packed_detail ヘルパーを grayscale.h に移動し Index/Grayscale で共用。IndexN の toStraight/fromStraight を grayscaleN 関数に統合。19テストケース追加、全179テスト通過。
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Summary
isIndexed=false,maxPaletteSize=0）grayscale8.h→grayscale.hにリネームし、Grayscale8 + GrayscaleN を統合bit_packed_detailヘルパー関数群（unpackIndexBits, packIndexBits, readPixelDirect）をgrayscale.hに移動し、Index/Grayscale で共用toStraightをgrayscaleN_toStraightに直接設定、fromStraightを委譲ラッパーに変更builtinFormats[]に6エントリ追加、getFormatByName()で名前引き可能copyRowDDA_Bit/copyQuadDDA_Bit共有）Test plan