Proxy Upgradeability Security Scanning: PROXION vs Slither vs OpenZeppelin Upgrades Plugin — Catching the $500M Bug Class

Proxy upgradeability bugs are responsible for over $500M in cumulative DeFi losses. The OWASP Smart Contract Top 10: 2026 added "Proxy & Upgradeability Vulnerabilities" (SC10) as a brand-new category — recognition that this bug class is no longer nic...