[codex] Add OKLab perceptual interpolation#26
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wow-miley merged 1 commit intoMay 24, 2026
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Adds OKLab and linear RGB color primitives in phosphor-core, plus opt-in NeutralColor.lerpOklab and ColorRamp.sampleOklab for perceptual interpolation across distant hues.
Keeps existing ColorRamp.sample behavior linear RGB and covers it with regression assertions.
Adds common tests for sRGB/OKLab round trips, amber-to-purple midpoint behavior, identity interpolation, and perceptual black-to-white grey.
Validation: ./gradlew ktlintFormat and ./gradlew jvmTest pass; ./gradlew iosSimulatorArm64Test was attempted but blocked before compilation by local disk exhaustion while unpacking Kotlin/Native.