Fixed
- Sensors — Added pre-patch Perl syntax check on Nodes.pm before applying the sensor patch. If Nodes.pm is already broken (e.g. from the v2.7.0 APT-hook heredoc bug), the user now gets an actionable error: "Run 'apt install --reinstall pve-manager' to restore it, then re-run ProxMorph install." instead of a misleading post-patch rollback message. Issue #47
- Sensors — Rollback on post-patch syntax failure now restores from
Nodes.pm.originalbackup when available, falling back to sed marker removal only if no backup exists.