Add comprehensive system administration instructions:
- Debugging principles
- Email sending via mail command
- Remote access tools (xpra, xfreerdp)
- Package management with epm
- Service management with serv
- VPN servers and access creation
- NFS group management with samba-tool
- Miscellaneous notes (Saby, gpush, etc)

- Split report into "Изменения" and "Проверка распространения" sections
- Show before→after values for each changed subdomain
- Add separate propagation check for each subdomain
- Remove generic A/AAAA format in favor of explicit subdomain listing

🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

- Add comprehensive eterban section with commands and usage
- Document access to priv.etersoft.ru (ssh -p 32 without root@)
- Add eterban log locations and settings
- Make DNS verification mandatory after changes
- Add Cloudflare DNS to verification checklist
- Improve DNS report format template

🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

- Server access (ssh dhash, ssh ipfs@dhash)
- Remote API access: ipfs --api=/ip4/91.232.225.49/tcp/5001
- Diagnostic commands
- Known issues: FD exhaustion, daily restart timer

🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

- check_upgrade_desktop.yml: replaced by upgrade_desktop.yml
- forZabbix/: no longer used
- gluster_update_from_task.retry: temp file

🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Document how to connect to Proxmox VMs via SPICE from CLI:
- pvesh API for obtaining credentials
- Correct .vv file format (proxy must use short hostname!)
- Script for Claude Code automation
- DISPLAY detection for remote GUI launch

🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

- Add warning() function for non-fatal errors
- Skip missing filters with warning instead of exit
- Better visual separation between test runs
- Change fatal to warning for partial regex matches

🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Replace etertimemachine with custom crdate function that:
- Creates daily snapshots with hardlinks
- Copies base/ directories separately (not hardlinked)
- Maintains 'last' symlink atomically

🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

upgrade_desktop.yml: use epm full-upgrade instead of manual steps
upgrade_telegram.yml: use epm play telegram

🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Chrome deprecated AuthServerWhitelist/AuthNegotiateDelegateWhitelist
in favor of AuthServerAllowlist/AuthNegotiateDelegateAllowlist.

🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

- DNS: ns1.etersoft.ru structure, zone files, nameservers
- NFS: servers, 16 groups workaround, FS-Cache setup
- Fail2ban: eterban integration with priv.etersoft.ru
- Proxmox: VM management, SPICE connection hints
- SSH: ALT Linux sshd_config path, StreamLocalBindUnlink
- Various admin workflow notes

🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>