test(shader-transitions): add midpoint (p=0.5) regression invariants for all shaders#378

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vanceingalls wants to merge 2 commits intovance/srgb-hdr-reference-testsfrom

vance/shader-midpoint-tests

Commits on Apr 23, 2026

fix(engine): reject libx264+HDR, document GPU mastering limits + mixed-transfer caller error
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test(shader-transitions): add midpoint (p=0.5) regression invariants for all shaders
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