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- GuildChatService.EmitSystemEventAsync: replaces no-op stub with real chat-row insertion via _msgs.AppendAsync (per-guild monotonic id). - GuildChatService.GetWindowAsync: real implementation — verifies caller membership, delegates to IGuildChatMessageRepository.GetWindowAsync (direction 1=OLD/2=NEW/3=BOTH, limit 50), returns adaptive wait interval (ChatPollActiveSeconds when messages returned, ChatPollIdleSeconds otherwise). - Drop unused repo injections from GuildChatService (guilds, invites, joinRequests). - GuildChatController.Messages: wires the full response — chat_message[], users[] (deduplicated author profiles with Emblem+Degree nav includes), maintenance_card_list (empty until maintenance service lands), wait_interval. - GuildChatPollTests (7 integration tests): fresh-guild CreateGuild event, sequenced Create+Join ordering, direction=NEW filter, direction=BOTH window, users[] deduplication, empty result for viewer-not-in-guild, active vs idle interval comparison. All 7 pass; full suite 1515/1515. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>