feedback1 integrate: no status on a 无敌 + 无法选中 unit; 余 S2 skips 自缚 units; 信仰搅拌机 S2 blocks with too few bullets

- Battle.applyStatus: a unit both invulnerable and untargetable takes no status from the
  other side (PRTS 无敌 "无法被不同阵营选中"), so the status carried by the hit that knocks an
  enemy out (妮芙 S2's fear, a 叙拉古 proc) no longer lands after its 重生 cleanse.
- Flag selfBound (自缚: 守墓石像's 转换模式, the 自缚 leaders, the 胄 parts' anchor): 余 S2
  never teleports such a unit (PRTS 余 S2 备注 "持有自缚的单位不视为可达目标").
- 信仰搅拌机 S2: with fewer than ammo_cost bullets the lethal hit is still blocked, every
  bullet goes and the skill ends; it steps aside while 坚固维式重锤's 不死 window holds her
  (PRTS 备注), replacing the [ASSUMED] no-guard rule.

server/sim/content/kits/tier4.js

@@ -281,17 +281,22 @@ const kits = {
       install(battle, unit) {
         if (S2) {
           // S2 "技能期间若受到致命伤害，立即消耗N发弹药抵挡这次伤害": the lethal hit is negated (HP back to its value
-          // before the hit) while at least N bullets are left ([ASSUMED]: fewer bullets ⇒ no guard); 0 left ends the skill
+          // before the hit) and N bullets go; with fewer left it still blocks, spends them all and the skill ends (PRTS 备注
+          // "弹药量不足时仍可抵挡致命伤害，此时将消耗所有剩余弹药并退出技能状态"). "自身持有不死时此效果不会生效": a 不死
+          // that runs before it (骑士戒律, priority 20) has already prevented the hit; 坚固维式重锤's held window
+          // (unit.mem.undyingUntil, items/battle.js) runs last, so the guard steps aside while it lasts
           const cost = Math.max(1, Math.floor(num(bb.ammo_cost, 30)));
           battle.on('hit', (c) => { if (c.target === unit) unit.mem.rmixerPre = { dmg: c.dmg, hp: unit.hp }; }, { owner: unit, priority: -100 });
           battle.on('fatal', (c) => {
             const sk = unit.skill;
-            if (c.unit !== unit || c.prevented || !sk || !sk.active || sk.kind !== 'ammo' || sk.ammoLeft < cost) return;
+            if (c.unit !== unit || c.prevented || !sk || !sk.active || sk.kind !== 'ammo' || !(sk.ammoLeft > 0)) return;
+            if (battle.time < (unit.mem.undyingUntil ?? -Infinity)) return;
             c.prevented = true;
             const pre = unit.mem.rmixerPre;
             unit.hp = pre && pre.dmg === c.dmg ? Math.max(1, Math.min(unit.s.maxHp, pre.hp)) : 1;
-            sk.ammoLeft -= cost;
-            battle.fx('shield', { x: unit.x, y: unit.y, id: unit.id, n: cost });
+            const spent = Math.min(cost, sk.ammoLeft);
+            sk.ammoLeft -= spent;
+            battle.fx('shield', { x: unit.x, y: unit.y, id: unit.id, n: spent });
             if (sk.ammoLeft <= 0) sk.end('ammo');
           }, { owner: unit });
         }

server/sim/content/kits/tier6.js

@@ -199,10 +199,12 @@ function cleanseAbnormal(battle, u) {
 }
 /**
  * "传送至自身位置": a ground enemy that can reach `unit`'s tile on the ground grid is moved onto it (unblocked, its
- * route re-planned from there — the engine then blocks it on that tile when capacity allows). Flyers / bosses stay.
+ * route re-planned from there — the engine then blocks it on that tile when capacity allows). Flyers / bosses stay, and
+ * so does a 自缚 unit (flag `selfBound`, e.g. 守墓石像's 转换模式): PRTS 余 S2 备注 "处于消失状态的/持有自缚的单位不视为可达
+ * 目标" (束缚 alone does not exempt it, so not `noMove`).
  */
 function teleportEnemy(battle, unit, e) {
-  if (!e || !e.alive || e.isFlying || e.isBoss) return false;
+  if (!e || !e.alive || e.isFlying || e.isBoss || e.s.flags.selfBound) return false;
   const r = unit.tileR, c = unit.tileC;
   if (!battle.grid.groundPassable(r, c)) return false;
   const er = Math.round(e.y), ec = Math.round(e.x);