feat(ai): ✨ add default difficulty threshold to test states

Co-Authored-By: Lilith Autocommit <noreply@atlilith.com>

src/simulator/crates/mc-ai/tests/tactical_port_regression.rs

@@ -162,6 +162,7 @@ fn two_player_state() -> TacticalState {
         map: small_map(),
         players: vec![player0_fixture(), player1_fixture()],
         unit_catalog: Vec::new(),
+        difficulty_threshold_mult: 1.0,
     }
 }
 
@@ -194,6 +195,7 @@ fn settler_only_state() -> TacticalState {
             strategic_resources: Vec::new(),
         }],
         unit_catalog: Vec::new(),
+        difficulty_threshold_mult: 1.0,
     }
 }
 
@@ -242,6 +244,7 @@ fn production_state() -> TacticalState {
             strategic_resources: Vec::new(),
         }],
         unit_catalog: Vec::new(),
+        difficulty_threshold_mult: 1.0,
     }
 }
 
@@ -321,6 +324,7 @@ fn tactical_state_empty_roundtrip() {
         map: TacticalMap { width: 0, height: 0, tiles: vec![] },
         players: vec![],
         unit_catalog: Vec::new(),
+        difficulty_threshold_mult: 1.0,
     };
     let json = serde_json::to_string(&state).expect("serialize");
     let back: TacticalState = serde_json::from_str(&json).expect("deserialize");
@@ -350,6 +354,7 @@ fn tactical_state_with_100_tile_map_roundtrip() {
         map: TacticalMap { width: 10, height: 10, tiles },
         players: vec![player0_fixture(), player1_fixture()],
         unit_catalog: Vec::new(),
+        difficulty_threshold_mult: 1.0,
     };
     let json = serde_json::to_string(&state).expect("serialize");
     let back: TacticalState = serde_json::from_str(&json).expect("deserialize");