tests: coverage round 6 (sequence, generators, renderer misc, multicam/serializer)
- sequence_test: Sequence/TrackList track wiring, length propagation, context/cache indexing, signals - node_generator_test: MatrixGenerator transform math, Shape/Solid/ Noise/Polygon shader jobs, TextGeneratorV3 formatting - render_misc_test: DynamicRenderer paths, Renderer texture/shader caches via stub renderer, color-management blit plumbing, PreviewAutoCacher scheduling - multicam_serializer_test: MultiCamNode sources/angles/grids, FootageDescription round trips, ProjectSerializer file and version handling
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