feat(simulator): ✨ Update siege damage and success conditions to integrate with city HP for balanced simulation

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

src/simulator/crates/mc-combat/src/siege.rs

@@ -27,14 +27,16 @@ const RANGED_CITY_HP_FRACTION: f32 = 0.75;
 
 /// Compute the penalty multiplier for melee attacks against a walled city.
 /// Returns a value < 1.0 that the attacker's effective strength is multiplied by.
-/// Scales by tier: 0=1.0, 1=0.70 (walls), 2=0.55 (castle).
-/// Paired with the melee-to-city damage fraction in resolver.rs that halves
-/// structural damage from non-siege melee attacks.
+/// Scales by tier: 0=1.0, 1=0.40 (walls), 2=0.25 (castle).
+/// p1-29 R5a: tightened from 0.70/0.55 → 0.40/0.25 so a walled city resists
+/// overwhelming siege ("+200% defense" handoff target). Paired with the
+/// melee-to-city damage fraction in resolver.rs and the BASE_CITY_HP=500 bump
+/// in mc-city. Siege units bypass via `siege_city_bonus`.
 pub fn melee_wall_penalty(wall_tier: i32) -> f32 {
     match wall_tier {
         0 => 1.0,
-        1 => 0.70,
-        _ => 0.55,
+        1 => 0.40,
+        _ => 0.25,
     }
 }
 
@@ -143,12 +145,12 @@ mod tests {
             "tier 0 (no walls) = 1.0"
         );
         assert!(
-            (melee_wall_penalty(1) - 0.70).abs() < EPS,
-            "tier 1 (walls) = 0.70"
+            (melee_wall_penalty(1) - 0.40).abs() < EPS,
+            "tier 1 (walls) = 0.40"
         );
         assert!(
-            (melee_wall_penalty(2) - 0.55).abs() < EPS,
-            "tier 2 (castle) = 0.55"
+            (melee_wall_penalty(2) - 0.25).abs() < EPS,
+            "tier 2 (castle) = 0.25"
         );
     }