feat(mc-turn): ✨ Introduce refound suppression tracking in GameState to prevent duplicate refounds during turn-based gameplay

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

src/simulator/crates/mc-turn/src/game_state.rs

@@ -914,6 +914,13 @@ pub struct PlayerState {
     /// `process_siege` when a city changes ownership.
     #[serde(default)]
     pub cities_lost_total: u32,
+    /// p1-29i: game-turn on which this player most recently LOST a city to
+    /// capture. Drives the post-capture refound cooldown
+    /// (`CombatBalance::refound_suppression`): `try_found_city` refuses to found
+    /// a replacement while `turn - last_city_lost_turn < cooldown_turns`.
+    /// `None` until the first city loss (and on old saves) → no suppression.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub last_city_lost_turn: Option<u32>,
     /// Derived realm-level statistics recomputed at end of every turn by
     /// `TurnProcessor::step → recompute_derived_stats`. All future derived
     /// scalars land here — single recompute site rule, see `mc_core::derived_stats`.