Add a music bed

Use the project and capability policy for scope, current state and metered work.

Stock-audio limits (verified in production): a Freesound import lands with audioRole:"sfx" and NO beat grid — import_resource takes no audioRole param, and materializeGrid grid:"beat" will 422 grid_unavailable on it. Set the role yourself when placing the clip (audioRole:"music" on the composition clip), put the bed on its own AUDIO track, kept dedicated to music. Discover curated music beds through list_catalog; use an available measured grid only when it exists. A music role alone does not establish a reliable beat grid.

You point at an existing composition that sounds empty; you get it back with a licensed bed that matches the brand's mood, sits correctly under any speech, and — where the bed drives pacing — cuts moved onto its beat grid. Attribution included, levels disciplined, one re-render.

Before you start