[0.2] Backport #4158 and bump versions to -beta1#4159

TheBlueMatt wants to merge 3 commits intolightningdevkit:0.2lightningdevkit/rust-lightning:0.2from

TheBlueMatt:2025-10-0.2-betaTheBlueMatt/rust-lightning:2025-10-0.2-betaCopy head branch name to clipboard