v2.3.0 - first maintained fork release

First release of the maintained AVD Monitoring Baseline fork. Includes upstream PR #839 (fixes deployment-blocking issue #812), KQL-based Available Memory alerts (fixes power-on false positives, issue #656), extended health-check mapping, FSLogix UserName/ProfilePath dimensions, re-tuned High CPU 85% alert, and a new CustomerName parameter for MSP multi-tenant attribution. Full details in patterns/avd/CHANGES.md and docs/Whats-New.md.