v0.8.18

Full Changelog: v0.8.17...v0.8.18
Bug Fixes

• Atomic self-upgrade: zvm upgrade now writes to a temp file and renames atomically, preventing
  corrupt binaries from partial writes or interrupted downloads
• Upgrade error handling: Explicit handling of copy errors during self-upgrade
• install.ps1 (Windows): Fixed incorrect extraction path that caused installs to fail when the
  zip doesn't contain a subdirectory
• install.ps1 (Windows Defender): Added Unblock-File after extraction and -Force on removal to
  prevent Defender quarantine and handle read-only executables
• Missing error return: Fixed errors.json not being returned where it should have been

Improvements

• Added zvm version command
• Updated CI
• Logging consistency improvements

Contributors

• @tristanisham — atomic upgrade, error handling, version command, CI
• @mynameistito (Tito) — install.ps1 Windows Defender fixes (#156)
• @msiarko (Mikhail Siarko) — install.ps1 unarchive path fix (#153)