Place prepared Takes on an independent Timeline with gaps and overlaps. Present picture, sound and captions through explicit Use rules while preserving source timing and project-authored styles.
Unify Companion bands, parameter ownership and source writeback in Studio. Migrate components, examples and authoring guidance, remove retired Speech/Semantic Track interfaces, and retain protocol identifiers at @1.
Validation: repository suite (786 tests; six sandbox-blocked tests passed on permitted rerun), 43 Studio tests after audit fixes, TypeScript, public declarations, four example-package builds, chat Source check and npm file inventory.
Speech publishes semantic timing and original audio. Media Performance and project components consume the prepared material, preserving source offsets across Takes while controlling their own framing and motion.
Add explicit renderer programs for coordinated HTML/CSS/JavaScript scenes, with typed media children, backdrop filtering and blending. Remove stand-in and estimated-take preview paths, migrate Sources and documentation, and demonstrate a Moment-driven video-to-diagram handoff.
kashorin