feedback5 WE1: 庇护 is one effect per unit — 宴, 余, 缪尔赛思, 赫拉格, 左乐 and 赫德雷 join the shared key (follow-up 18)

gamedata_const ba.protect / PRTS 术语 庇护 "受到的物理和法术伤害降低相应比例（同名效果取最高）": the strongest source holds; the
自选 kits already used battle.applyStrongest('protect'), these six multiplied private cuts with it.

- kits/shared/tier1.js: PROTECT, protectMods, PROTECT_TICK_HOLD and holdProtect (applyStrongest on the shared key).
- 宴 / 赫拉格 / 左乐 (below their HP threshold): refreshed every tick and at each hit on them; 余 (blocking) and 缪尔赛思's
  melee copies at their old cadence; 赫德雷's 庇护 joins the key, his CRU-X 物理伤害 + becomes its own instance. 左乐 keeps the
  PRTS S2 ordering (his own 庇护 newer than his barrier cuts behind it); 行险 drops his own held 庇护 for its 0.1 s
  re-judgement [ASSUMED: another source's returns with its next refresh]. 遥's bubbles stay separate (the client's
  damage_resistance[bonus] multiplies with the common damage_resistance[inf]).

Golden: no scenario moved — no unit of the corpus holds two 庇护 at once, and one source alone cuts exactly as before.

Tests: test/content/feedback5-protect.test.js (new, 2); kits_t6 (余), kits_alt_t6 (缪尔赛思), op_hodrer updated to the
shared key; kits_t1t2, op_helage, op_zuole pass. Docs: SIM.md §3, kits/README.md checklist 9.

docs/SIM.md

@@ -573,7 +573,7 @@ application competes with instead of its `value`, which stays its effect (Raidia
 catalogue status the same rule (one invisible buff `key` per target whatever applies it — no immunity, 抵抗, status hooks
 or icon): the engine default for two same-named buffs (PRTS 作战机制 "同名buff的默认叠加策略buff只能表现出一个"). 奥术 uses
 it, so the two players of a pair field compete for one instance instead of multiplying, and so do 灵知's 坚冰 and the
-莱恩哈特 / 缄默德克萨斯 RES cuts, once keyed per unit (DESIGN §20.10). "Strongest" = the largest |value|. PRTS 盟约记录's
+莱恩哈特 / 缄默德克萨斯 RES cuts, once keyed per unit (DESIGN §20.10). 庇护 (gamedata_const ba.protect "受到的物理和法术伤害降低相应比例（同名效果取最高）") is one such effect whoever grants it: every kit holds it under the shared key (`kits/shared/tier1.js` `PROTECT` / `holdProtect`, mods phys / artsTakenMul ×(1 − v)) — 宴, 余, 缪尔赛思, 赫拉格, 左乐 and 赫德雷 since 0.2.0 (they used private multipliers that multiplied with each other) —, except 遥's bubbles (the client's damage_resistance[bonus], which multiplies with the common damage_resistance[inf]). "Strongest" = the largest |value|. PRTS 盟约记录's
 奥术 note "※同一单位仅可对同一目标同时施加1个该盟约法术伤害提升效果" limits each unit to one instance per target; read with
 the engine default — a newer same-named buff waits inert until the earlier ones end (PRTS 常见同名状态 "默认叠加方式") — and
 巴哈姆特 12316 ("共享型buff會跟對面搶"), one instance is effective at a time, which is what applyStrongest keeps; strongest