Add minimum version validation for all dependencies across local and
remote machines (jq>=1.6, curl>=7.70, git>=2.30, docker>=20.0,
compose>=2.0, shellcheck>=0.8, gh>=2.0). Setup scripts now record
every install action to .manifests/<host>.manifest files, enabling
full rollback via setup/cleanup.sh. teardown_all.sh gains --cleanup
flag to chain prerequisite removal after phase teardowns.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
