Atomic swap support (Tesuji)

Atomic swaps are a feature, not infrastructure, so although they are among the list of goals they are not a necessity for launch. When the time comes, we’ll go ahead to regardless of whether atomic swaps are ready to go.

The issue contains no files, tests, entry points, or implementation requirements. Start by clarifying the intended atomic-swap behavior and how it fits the project’s launch goals; done cannot be defined from the current issue text.

Written by the indexing model from the issue text.