Freeze 7.6.0 release candidate and move docs out of repo

Ariver

2026-05-22 8478c55e513bbbb4b1676d1d9207f7feb2509465

Research/SmartStart/UltimateDefaultCatalog/SmartStart_UltimateDefaultCatalog_DuplicateReview.csv does not exist in tree aac62ea560ece96c0569796b08dc788aaa59a52c