feat(engine): add HDR two-pass compositing — DOM layer + native HLG video#288

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vanceingalls merged 7 commits intomainfrom

feat/hdr-phase-1

Apr 19, 2026

Commits on Apr 19, 2026

feat(engine): add HDR two-pass compositing with DOM alpha overlay

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refactor: consolidate PNG decoder, fix assertions in alphaBlit

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fix(producer): preserve window.__hf properties in bridge script

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fix(hdr): address review feedback across stack

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test(engine): expand PNG decoder coverage + α=254 boundary
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fix(hdr): address deferred items from PR #288 review
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fix(producer): preserve window.__hf set by page scripts
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