When a CVE already exists on an asset (e.g. seen by Wazuh first) and
Nessus reports its own CVSS, the Nessus value now wins instead of the
previous max-merge behaviour. Fixes the common case where Wazuh assigns
a placeholder 10.0 but Nessus has the accurate per-plugin score (e.g.
7.4). Falls back to keeping the existing value when Nessus has no CVSS
or severity, so we never wipe valid Wazuh data.
Adds scores_overridden counter to sync stats + log line.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>