Month: 2026-05 — Delivered a reliability-focused fix for extension installations in zed (zed-industries/zed), targeting cross-filesystem scenarios to improve reliability and user experience. The work aligned with business goals to reduce install failures across environments and lowers support friction while maintaining performance and safety. Key improvements include safe cross-device extension installation by unpacking the extension in a temporary directory within the installed extensions directory and performing the final rename on the same filesystem, preventing cross-device link errors. This specifically addresses issues observed when cache and data directories reside on different filesystems. The change is accompanied by a targeted self-review checklist and release notes. Impact areas: - Stability: Eliminates EXDEV errors during extension installs when cache and data directories are on separate filesystems. - Reliability: Reduces user-visible failures, especially in environments with multiple subvolumes or mount points. - Performance: No regression in install speed; temporary unpack strategy keeps operations local to destination filesystem. - Maintainability: Clear rationale for temporary unpack location and fallback preserved.