Add inputBody/outputBody/inputHeaders/outputHeaders to ExecutionDetail DTO so exchange-level bodies are returned by the detail endpoint. Show "Exchange Input" and "Exchange Output" panels on the detail page when the data is available. Fix RouteFlow node click selecting the wrong processor snapshot by building a flowToTreeIndex mapping that correctly translates flow display index → diagram node index → processorId → processor tree index. Previously the diagram node index was used directly as the processor tree index, which broke when the two orderings differed. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>