Document and test SYNC-PAGE behavior, add the NIP-11 advertisement toggle, extend e2e coverage, apply small backfill cleanup fixes, and bump release metadata.
Add an internal SYNC-PAGE websocket frame and use it from req_stream sync workers to backfill protected event history deterministically by (created_at, id) before starting the live tail.
The worker discovers a remote cutoff, ingests bounded ascending pages up to that cutoff without advancing the live cursor early, and only advances the cursor when the historical window is complete. The three-node Docker gap scenario now runs req_stream with a small backfill page size to exercise multi-page catch-up.
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