dgb: unify SEGWIT_ACTIVATION_VERSION to single SSOT (oracle=35, frstrtr/p2pool-dgb-scrypt; merged-v36 byte-compat WAIVED)

[frstrtr]

What

Unify DGB SEGWIT_ACTIVATION_VERSION to a single source of truth at the oracle-canonical value 17.

Why

Split-brain found during #161 inst#4 version-gate SSOT audit: the real consensus gate (share_types.hpp + the 6 constexpr gates in share_check.hpp) already read 17, matching BOTH oracles (p2pool-dgb-scrypt and p2pool-merged-v36 @42ccca53). A stale 35 sat in the consumer-less params.hpp:66 field — a typo from my earlier c51f39b.

Inverse-correction applied: corrected config 35->17 FIRST, then unified onto the single SSOT, so convergence lands on the oracle value with zero behavior change rather than propagating the error.

Scope / classification

• NOT consensus-moving: the live gate already read 17; only the consumer-less field changed.
• 3-bucket: coin-specific consensus constant -> per-coin is correct, NOT a standardization candidate.
• Single-coin DGB scope. Oracle-cited SSOT. GPG-signed. build EXIT=0.

HOLD merge — gated on operator tap (surfaced on #161 thread).

[frstrtr]

Adjudicated vs the canonical DGB oracle (frstrtr/p2pool-dgb-scrypt). CORRECTION to the earlier head (bbbb0e0 unified to 17 — wrong direction).

Two-oracle split confirmed:

• p2pool-merged-v36 digibyte.py (farsider350-based): SEGWIT_ACTIVATION_VERSION = 17 — byte-compat WAIVED for DGB per operator 2026-06-17.
• frstrtr/p2pool-dgb-scrypt (canonical DGB oracle) digibyte.py:27: SEGWIT_ACTIVATION_VERSION = 35.

Master split-brain: config_pool.hpp=35 but share_types.hpp hardcoded 17; the consensus gate in share_check.hpp resolved to the share_types value (17), diverging from the oracle. New head 4953870 collapses to one SSOT in config_pool.hpp (=35); share_types.hpp + params.hpp derive from it.

Consensus-relevant: shares with version in [17,35) are no longer spuriously segwit-validated against the canonical network. Rest of config_pool.hpp re-verified fully conformant to the oracle (SHARE_PERIOD=15, SPREAD=24, LOOKBEHIND=100, BLOCK_MAX=32M/128M, IDENTIFIER 4b62545b1a631afe, PREFIX 1c0553f23ebfcffe, SOFTFORKS). Build EXIT=0 (target c2pool-dgb). GPG-signed. HOLD merge.