ebml-webm
Sans-IO EBML/WebM mux + demux. Freestanding — no Mediaway types.
Unprefixed reusable core — naming ADR-0012.
Product Mediaway surface: mediaway-container (webm module).
See docs/roadmap.md, adr/0001
(demux element subset), adr/0002
(lacing/BlockGroup), and adr/0003 (mux) for the
exact scope and what is still deferred.