Why: plan section 2/KTD6 found the listener fetched only the last event of a batch (intermediate events invisible to live subscribers) and kept waiting on a dead connection after a drop (no actual reconnect).
Evidence: pgbus suite green twice against real PostgreSQL - batch of 64 all visible with continuous seq, 1200 events across pages, connection-kill reconnect recovers the outage window, no-notify events delivered by the periodic rescue; full backend suite green on both tiers.
Impact: Listener tracks per-conversation cursors (first-seen catch-up from 0 is harmless under SSE seq dedup), pages via EventsAfter to the notified watermark, rebuilds the connection with backoff and resumes known streams, and a rescue ticker covers lost notifications; Notifier contract unchanged.
Refs: proposals/2026-10-11-collaboration-storage-and-distribution.md U6 slice 1, KTD6; R5.
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