Architecture decisions

Accepted here means a design baseline for scaffolding, not completed software. Revise through a new ADR and mark superseded decisions explicitly.

ADR	Status	Decision
0001	Accepted for scaffold	Headless Rust runtime with a vendor-independent domain
0002	Accepted for scaffold	Web-first UI, optional desktop shell
0003	Accepted for scaffold	Ordered events and an injected frame clock
0004	Accepted for this repo	Keep Docusaurus, separate docs from software
0005	Accepted; initial process test passed	One dedicated mixer container plus four CDJ containers per club

Each ADR records context, decision, consequences, date, and implementation status.