tests: coverage round 7 (audio, distort, filter/keying, math/transition nodes)
- node_audio_test: PanNode/VolumeNode sample math, TimeInput, ValueNode - node_distort_test: transform/crop/flip/cornerpin/mask/ripple/swirl/ tile/wave inputs, shader code, value jobs, resolution autoscale math - node_filter_keying_test: opacity/blur/dropshadow/mosaic/stroke jobs, chroma/color-difference key and despill value composition - node_math_transition_test: TrigonometryNode ops, MergeNode, TransitionBlock offsets/progress/crossfade math, SubtitleBlock, traverser globals and table caching
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