An ADR captures one durable decision and its consequences. Use an ADR for a cross-cutting decision that isn't the full implementation architecture of an Epic (that's a DD), or to record a major reversal of a previously Accepted DD.
- Naming:
ADR-NNN-<slug>.md. - Template:
ADR-000-template.md. - ADRs are immutable once Accepted; supersede rather than silently edit.