Why: Legacy upload events and synced duty flows need the same private-data and current-state guarantees as new member work.
Evidence: Real legacy SSE leakage and independent duty replay findings; correction evidence remains in the canonical task record.
Impact: Describe trusted per-event sharing and durable duty versions without new mandatory downstream interfaces or runtime changes.
Refs: system-project-membership r1.1; Dev feature/project-member-access
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