Formalizing a proof in Lean using Claude Code

I revisit the formalization task I did nine months ago in    • Formalizing a proof in Lean using Github c...   , but this time use a recent version of Claude Code to agentically do most of the formalization, while still leaving enough interactivity to stay manually engaged with the formalization task. The final code can be found at https://github.com/teorth/analysis/bl... The informal proof was provided by Bruno Le Floch at https://leanprover.zulipchat.com/#nar...