Count Fartooth granted layers on doll swaps (#415, #429)

docs/design/engine.md

@@ -174,6 +174,8 @@ Each domain file `server/sim/content/{tokens,bonds,garrisons,items,bands,enemies
 - kits: all 112 visible chess + hidden ones used by effects (盟约·辅助干员), default skill + talents + trait specifics; tokens. The 72 non-collaboration 6★ DIY operators include 克莱门莎 (§28.1); her launch-day provisional mechanics are local to her kit. 黍 GUA-Y and 乌尔比安 CRU-Y follow the generated module blackboards and existing module-level rules (§28.2).
 - bonds: 23 (battle + meta), exact per-layer formulas from research 02.
 - garrisons: 43 effect keys (IN_BATTLE via hooks; SERVER_* via meta registry).
+  远牙's granted `garrison_108_a/b` additionally gains on both directions of `dollSwap`, sharing its deployment
+  cap and active-bond checks (player-confirmed, §28.5). This extra trigger is specific to that granted trait.
 - items: 56 equipment (+golden) + 3 Arts; 变形同构体 bond grant; VI-tier set/combos.
 - bands: 40 strategies (meta + battle). 鸭爵 “神秘顾客” swaps 0–2 ground enemies (not the leader, its parts or bounties; on a pair boss field only the player's half — the boss / hidden `onBattleStart` event carries `routes` and `side`) in every teammate's normal / Final Assault / Hidden Core battle from R5 into the act2 鸭爵 / 高普尼克 / 流泪小子 / 圆仔 (lpr 1, 1 fund to the killer, 联防 included) (§21.5); the swaps carry the spawn tag `'duck'`, and the swapped 流泪小子 hides again 1 s after a block ends, not the official 0 s (the owner's decision of 2026-10-07, §25.22.6).
 - enemies: special-type behaviours (FLY, TIMES, ELEMENT, DOT, INVISIBLE, REFLECTION, SPECIAL) and notable individual abilities from `data/enemies.json`; bosses 1–10 scripted — the huge leaders (假想敌：胄 ×2, 假想敌：管 ×2, 盐风主教昆图斯, 阿利斯泰尔, “萨米的意志”) are 自缚 + 无法被阻挡 (PRTS 天赋; `content/bosses.js SELF_BOUND`: a persistent noMove + unblockable buff from spawn) with their hit area (§19.4); 圆仔 and 鸭爵 are 无法被阻挡 (PRTS 天赋, §21.5); the knock-out forms follow PRTS — 深池逐火 余烬 (5 / 10 hits, 隐匿, blockable, back after 10 s), 转译基底·α (damage cancelled until its 2 s change into 寻仇者 / 特战术师 / 幽灵), the leaders' 重生, 守墓石像's statue and flight — and every 重生 clears what operators put on the enemy and restarts its skills from their initial cooldown (§21.4, §21.19); the mode's air units are 静态刚体, never moved (§21.9); leader parts (斩胄之剑 / 破胄之锤 / 碎铳之簧) pass every damage they take to their leader 1:1 as 无来源 HP loss (`PART_TRANSFER` 1, PRTS "等量"), a 假想敌：胄 drone that dies costs it 2 % of the pool (`DRONE_LINK_BASE 'pool'`) (§20.10, §20.13); devices/terrain.