- Add ignore_soa_records flag (default: true) to automatically ignore SOA records
- Add ignore_dnssec_records flag with default changed to true
- Add validate_records flag (default: true) with record value validation
- Implement _validate_record_values() method supporting:
- IPv4/IPv6 address validation for A/AAAA records
- FQDN validation for CNAME/MX/NS/PTR/SRV records
- Text record acceptance for TXT/SPF records
- Add global dns_server parameter for shared server configuration
- Add verbose output with per-record action tracking
- Add diff mode support for --diff flag
