# 02-DESIGN The authoritative specification. Implementation is built against what is written here. A document enters this folder only after the decision behind it is recorded in [`adr/`](../adr/) and the research that produced it is marked `GRADUATED`. Empty for now: the decomposition in ADR 0001 is decided but not yet specified. The first entries will be the per-context designs — `hal/mesh` brokering, the `hal/stream` record, and the feature model that `hal/delivery` owns.