Wires the ResourceSale gold flow into the live economy (leveraging the p3-24
phase-1 economy port). GdTradeLedger gains gold_flow_for + incoming_strategics
#[func]s; GdEconomy gains a trade_gold param added to net gold AFTER the yield /
golden-age multipliers (a trade transfer must not be amplified by difficulty
handicap); economy.gd._player_trade_gold reads GameState.trade_ledger_json via
GdTradeLedger and passes the player's net flow. A seller now gains gold and a
buyer pays it each turn a sale is active.
Verified: GUT test_trade_gold_flows_into_net_gold (seller +3 → net 8, buyer −2 →
net 3, trade_gold echoed); dylib rebuilt + canonical GUT 748/0.
p3-23 stays partial — gold-trade flow now live (part A); remaining part B is the
strategic-resource gating (FFI sources tile_strategics, PlayerState.traded_strategics,
unit-gating reads incoming_strategics) + the deal UI.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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