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

test/content/garrisons_battle.test.js

@@ -481,9 +481,10 @@ test('attrByBond (26 ids): floor(Σ layers of the listed ACTIVE bonds / divide_n
     const k = Math.floor((L * list.length) / div);
     const m = h.unit('op').findBuff(`gar:${gid}`).mods;
     const want = {};
-    if (bb.atk) want.atkMul = 1 + bb.atk * k;
-    if (bb.max_hp) want.hpMul = 1 + bb.max_hp * k;
-    if (bb.def) want.defMul = 1 + bb.def * k;
+    // "每叠加N层…+X%" is 直接乘算: the additive percentage bucket (support directMods)
+    if (bb.atk) want.atkPct = bb.atk * k;
+    if (bb.max_hp) want.hpPct = bb.max_hp * k;
+    if (bb.def) want.defPct = bb.def * k;
     if (bb.attack_speed) want.aspd = bb.attack_speed * k;
     if (bb.hp_recovery_per_sec) want.hpRegen = bb.hp_recovery_per_sec * k;
     if (bb.sp_recovery_per_sec) want.spRecoveryFlat = bb.sp_recovery_per_sec * k;