Define dev stack

この issue には説明がありません。

The issue body is empty, providing no guidance on what 'Define dev stack' entails. A newcomer would need to understand the organization's goals and existing practices. Start by exploring the repository's other files and any linked documentation to infer the intended scope. 'Done' would be a proposed or documented development stack, but this requires significant design work and domain knowledge.

索引モデルが issue の本文から書いたものです。