Users on unsupported PVE versions now get clear guidance at every
layer — README, install time, and GitHub release notes — rather than
silently failing or getting confusing patch errors.
- README: replace bare compatibility table with a full matrix and
prominent callout blocks for PVE 7 (last v2.x), PVE 8 (EOL
2026-08-31), PVE 9+ (use v3.0), and PVE ≤6 (unsupported)
- postinst: add check_pve_version() that exits on PVE < 7, warns
loudly on PVE 7 (stay on v2.x, do not upgrade to v3.0), notes
the PVE 8 EOL date, and warns on PVE 9+ (v2.x not supported)
- build.yml release template: add a version compatibility table so
every GitHub release prominently states who should and should not
install it
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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