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

server/match/bot.js

@@ -12,7 +12,9 @@
 //      (free levels always; the −1/round discount is waited for early), then keep buying / refreshing with what is
 //      left: merge progress (pairs → elites) > bond thresholds (focus core bond, add-ons 2/3) > role needs
 //      (blockers, anti-air when the wave flies, one or two healers) > tier; with a full board a buy must improve the
-//      best lineup. Items only when a deployed operator can carry them.
+//      best lineup. Items only when a deployed operator can carry them. A merge that consumes a deployed copy leaves
+//      the elite on that copy's tile (PRTS 卫戍协议/帮助, PlayerState._mergeChess): nothing here assumes it in the hand —
+//      steps 3–4 plan it like any owned unit (kept, moved or benched).
 //   3. lineup: the deployed set maximizes unit value + activated bond tiers (exact counting via computeBonds) +
 //      composition (chooseLineup: greedy seed + swap hill-climbing).
 //   4. placement (planLayout): the round's routes are traced over the own board from the enemy preview (ground