- Add groupName field to ExecutionDetail record and DetailService - Dashboard: fix TDZ error (rows referenced before definition), add selectedRow fallback for diagram groupName lookup - ExchangeDetail: rewrite to match mock layout — auto-select first processor, Message IN/OUT split panels with header key-value rows, error panel for failed processors, Timeline/Flow toggle buttons - Track diagram-mapping utility (was untracked, caused CI build failure) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>