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Task 8.4: schedule queues one sandbox reminder (OutboundService) + a SYSTEM_ALERT inbox item per participant, idempotent (outbound key + per-meeting marker) + meetingReminderQueued event. CalendarProjector consumes aiArtifactAccepted → for each EVENT claim proposes a meeting_request (PROPOSED, sourceClaimId), idempotent via claim() + per-claim dedup. 2 tests: reminder replay-safe, AI-event→request once. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>