v1.0.0

Changelog

• 34c0872 docs: add Ansible usage example
• b156fd8 fix: use install command to set permissions in one step
• edbb0fc fix: keep original filename for checksum verification
• acb9de9 fix: support prerelease installs via PRERELEASE=1 env var
• 97dc70a docs: update exit code table and flags for fail-closed default