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DanConwayDev
5d3e419be3
Motivation: the two-level core/descendant policy forced every core tag variant to stay live while treating every descendant variant alike. As repository scale grows, that either consumes the transient recovery slot or demotes useful canonical coverage together with low-value compatibility forms. Approach: keep announcements, state, repository a and root e filters essential. Reconcile root E, core q/A, descendant e/a and descendant q as an ordered complete-tier prefix against the existing NIP-11-aware ledger, filter-count grouping and byte budget. Pack adjacent tier filters together, reserve one historic slot, and feed all filters below the cutoff plus descendant E/A through the existing five-second cursor-overlapped REQ+EOSE queue. Correctness: historic sync still receives the full original filter set; only persistent admission changes. A tier is never partially admitted, fallback cursor state survives unchanged filters, CLOSED auxiliary subscriptions immediately return their demoted filters to rotation, and all consumers continue to share the existing ledger. Excluded scope: no connection sharding, new scheduler, request-class priority, configuration, or historic repository packing is included. Validation: nix develop -c cargo test --lib (685 passed); focused tier-cutoff, filter-tier and descendant-rotation tests passed.