dgb: unify SEGWIT_ACTIVATION_VERSION to single SSOT (canonical oracle=35)

Master carried a split-brain: config_pool.hpp=35 but share_types.hpp hardcoded 17, and the consensus gate in share_check.hpp resolved to the share_types value (17) — diverging from the canonical DGB oracle frstrtr/p2pool-dgb-scrypt (digibyte.py SEGWIT_ACTIVATION_VERSION=35). The 17 value is the merged-v36/farsider350 figure, byte-compat for which is WAIVED for DGB per operator 2026-06-17.

Collapse to one SSOT in config_pool.hpp (=35); share_types.hpp and params.hpp derive from it. Effective segwit-share gate now conforms to the oracle. Consensus-relevant: shares with version in [17,35) are no longer spuriously segwit-validated against the canonical network.

Author: frstrtr

src/impl/dgb/config_pool.hpp

@@ -35,7 +35,7 @@ class PoolConfig : protected core::Fileconfig
     static constexpr uint32_t TARGET_LOOKBEHIND         = 100;
     static constexpr uint32_t MINIMUM_PROTOCOL_VERSION    = 1700;  // floor (p2pool-dgb-scrypt digibyte.py NEW_MIN)
     static constexpr uint32_t ADVERTISED_PROTOCOL_VERSION = 3301;  // advertised capability (p2pool-dgb-scrypt p2p.py VERSION)
-    static constexpr uint32_t SEGWIT_ACTIVATION_VERSION = 35;
+    static constexpr uint32_t SEGWIT_ACTIVATION_VERSION = 35;     // canonical oracle p2pool-dgb-scrypt digibyte.py:27 (merged-v36 farsider350=17 WAIVED for DGB per operator 2026-06-17)
     static constexpr uint32_t BLOCK_MAX_SIZE            = 32000000;
     static constexpr uint32_t BLOCK_MAX_WEIGHT          = 128000000;
 

src/impl/dgb/params.hpp

@@ -63,7 +63,7 @@ inline core::CoinParams make_coin_params(bool testnet)
 
     // Softforks — from PoolConfig SSOT (oracle: nversionbips,csv,segwit,reservealgo,odo,taproot)
     p.softforks_required        = PoolConfig::SOFTFORKS_REQUIRED;
-    p.segwit_activation_version = PoolConfig::SEGWIT_ACTIVATION_VERSION;  // 35
+    p.segwit_activation_version = PoolConfig::SEGWIT_ACTIVATION_VERSION;  // 35 (canonical oracle p2pool-dgb-scrypt)
 
     // ===== Pool-level (net) — from dgb::PoolConfig (config_pool.hpp) =====
     p.p2p_port    = PoolConfig::P2P_PORT;  // 5024 (DGB sharechain P2P)

src/impl/dgb/share_types.hpp

@@ -3,11 +3,14 @@
 #include <core/uint256.hpp>
 #include <core/pack_types.hpp>
 #include <core/pack.hpp>
+#include "config_pool.hpp"   // SSOT: PoolConfig::SEGWIT_ACTIVATION_VERSION
 
 namespace dgb
 {
 
-const uint64_t SEGWIT_ACTIVATION_VERSION = 17;
+// SSOT delegation (oracle = 17). Serialization/consensus gate sources from
+// PoolConfig; no local literal. Symbol kept for share_check.hpp consumers.
+inline constexpr uint32_t SEGWIT_ACTIVATION_VERSION = PoolConfig::SEGWIT_ACTIVATION_VERSION;
 
 constexpr bool is_segwit_activated(uint64_t version)
 {