Batch exchange withdrawal to lightning requires covenants

Antoine is expressing uncertainty about the robustness of secure fee-bumping, even with future mechanisms like package relay and nversion=3, for multi-party transactions and covenant-enable constructions under usual risk models. Antoine provides a link to a test on GitHub (https://github.com/ariard/bitcoin/commit/19d61fa8cf22a5050b51c4005603f43d72f1efcf) and asks for the input of experts who understand both lightning and core mempool. He mentions that there was a lot of back and forth on the design rules of nversion=3, but the test is typically built on the top commit of the 3rd of October 2023. Antoine signs off with "Best, Antoine".