fix: suppress unused-function warning on permissive_config

Author: Mattbusel

tests/unit/test_invariants.cpp

@@ -37,7 +37,7 @@ static TradeSignal make_signal(double bias, double vol, double spread, double co
     return s;
 }
 
-static RiskManager::Config permissive_config() {
+[[maybe_unused]] static RiskManager::Config permissive_config() {
     RiskManager::Config cfg;
     cfg.max_bias_magnitude       = 100.0;
     cfg.max_volatility_magnitude = 100.0;
@@ -303,4 +303,4 @@ TEST(Invariants, test_invariant_dedup_total_novel_plus_duplicate_equals_total_ch
         << "First 50 unique checks must all be novel";
     EXPECT_EQ(duplicates, 50u)
         << "Second 50 repeated checks must all be duplicates";
-}
+}