fix: reclaim non-writable /tmp/gh-aw/sandbox before AWF writeConfigs() to prevent EACCES#42400

pelikhan with Copilot wants to merge 2 commits into

maingithub/gh-aw:mainfrom

copilot/aw-failures-reclaim-rootless-sandboxgithub/gh-aw:copilot/aw-failures-reclaim-rootless-sandboxCopy head branch name to clipboard