Playtest #6 follow-up (v2.5.1): leader HP review — 直接乘算, one debuff instance, 999 layer cap, 限伤; elite to the board; 假想敌：胄 kit

- co-op leaders died within seconds: leader HP is the official data (40 values pinned); bond / strategy / item /
  机变 / 特质 "+X%" bonuses now add up (PRTS 直接乘算) instead of compounding; a same-named enemy debuff keeps one
  (strongest) instance per target (奥术 across a pair field); leader parts pass damage 1:1; fixed co-op pool (the user's call)
- official limits read from the client: each bond stops at 999 layers (MAX_GARRISON_STACK); a leader hit of 300000+ in
  boss / hidden battles is cancelled (MAX_BATTLE_DAMAGE, 限伤) — shared/constants.js switches, research 11
- a merge that consumes a deployed copy puts the elite on that tile and facing (user-confirmed); gold target highlight,
  promotion effect
- 假想敌：胄 per PRTS: one shell, shells within range, any drone death costs 2 % max HP, 剑/锤 sorties and 瘫痪
- DESIGN §20.10–§20.14; 2842 unit tests, all 28 browser suites green; Chrome = Node on boss fields

docs/research/01-core-data.json

@@ -9560,7 +9560,11 @@
    "source": "official intro '多余的装备无法进行出售，可以销毁'"
   },
   "promotion": {
-   "eliteGoesTo": "hand",
+   "eliteGoesTo": "hand; when a consumed copy was deployed, that copy's board position (PRTS 卫戍协议/帮助 '发送1名【精锐】状态的该干员至手牌区（若消耗已部署至作战区的干员，则发送至作战区对应位置）'; user-confirmed after playtest #6)",
+   "eliteTileAmongSeveralDeployed": {
+    "rule": "the consumed deployed copy that deploys first (board row desc, then col asc; mirrored on the right boss half), with its facing",
+    "assumed": true
+   },
    "equipmentReturnsTo": "hand",
    "reward": "shop temporarily shows 3 ops of tier min(shopLevel+1,6) at price 0; take 1; no refresh/freeze; expires at round end",
    "verified": true