Update frontmatter and add a changelog

Author: ch1bo

docs/leios-design/README.md

@@ -14,7 +14,7 @@ author:
 
 This technical design document bridges the gap between the protocol-level specification ([CIP-164](https://github.com/cardano-foundation/CIPs/pull/1078)) and its concrete implementation in [`cardano-node`](https://github.com/IntersectMBO/cardano-node). While CIP-164 defines *what* the Leios protocol is and *why* it benefits Cardano, this document addresses *how* to implement it reliably and serve as a practical guide for implementation teams.
 
-This document builds on the [impact analysis](../ImpactAnalysis.md) and [early threat modelling](../threat-model.md) conducted. The document outlines the necessary architecture changes, highlights key risks and mitigation strategies, and proposes an implementation roadmap. As the implementation plan itself contains exploratory tasks, this document can be considered a living document and reflects our current understanding of the protocol, as well as design decisions taken during implementation.
+This document builds on the conducted [impact analysis](../ImpactAnalysis.md) and [threat modeling](../threat-model.md). The document outlines the necessary architecture changes, highlights key risks and mitigation strategies, and proposes an implementation roadmap. As the implementation plan itself contains exploratory tasks, this document can be considered a living document and reflects our current understanding of the protocol, as well as design decisions taken during implementation.
 
 Besides collecting node-specific details in this document, we intend to contribute implementation-independent specifications to the [cardano-blueprint](https://cardano-scaling.github.io/cardano-blueprint/) initiative and also update the CIP-164 specification through pull requests as needed.