Upgrade Lodestar v1.44.0 Before Glamsterdam Fork

Lodestar v1.44.0 released; all testnet and mainnet nodes advised to upgrade. Continues progress toward Glamsterdam (ePBS) fork, adds experimental Fast Confirmation Rule (FCR). FCR confirms blocks faster but is performance-intensive; not recommended for production nodes. Breaking change: deprecated v1 beacon API endpoints removed; migrate to v2 before upgrading.