dgb: walk-forward getheaders — embedded sync past 2000-header cap - #257
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…er cap The NodeP2P producer fired new_headers on each batch but never re-requested, stalling initial sync at the per-message 2000-header cap. On a full (non-announcement) batch, re-issue getheaders anchored on the last header received; the loop terminates when the peer returns a short/empty batch (caught up). Producer-transport only, non-consensus.
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Phase B (NodeP2P producer follow-up to #256). The producer fired new_headers per batch but never re-requested, stalling initial header sync at the per-message 2000-header cap. On a full (non-announcement) batch this re-issues getheaders anchored on the last header received; the loop terminates when the peer returns a short/empty batch (caught up).
Scope: src/impl/dgb/coin/p2p_node.hpp only — producer transport, non-consensus, single-coin. Build c2pool-dgb EXIT=0. HOLD merge (operator tap).