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DanConwayDev
d203f9de56
Historic REQ+EOSE currently groups filters, waits for one shared-ledger transient permit at a time, and retains each permit until the relay terminates the subscription. Descendant fallback needs exactly that lifecycle; copying the loop would make capacity and pagination fixes diverge. Extract the grouped subscription loop behind one SyncManager helper. The caller still creates the batch at the same point, uses the same filter grouping and request class, and receives the same subscription and pagination maps. No scheduling, priority, grouping, or capacity policy changes. This deliberately does not introduce descendant work or a new queue. Correctness assumes the helper remains awaited serially just as the inlined loop was. Validated with cargo check --lib; workspace rustfmt was not applied because the installed formatter would rewrite unrelated baseline files.