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Surfaces past group participant data from WhatsApp history sync messages. Previously pastParticipants was dropped during event buffering because it was overwritten instead of accumulated across chunks. - src/Types/Events.ts: add pastParticipants to BaileysEventMap['messaging-history.set'] and BufferedEventData.historySets - src/Utils/event-buffer.ts: accumulate pastParticipants via spread array instead of overwriting; include in consolidateEvents output - src/Utils/history.ts: pass item.pastParticipants in processHistoryMessage return Refs: WhiskeySockets/Baileys#2426 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>