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.

server/sim/content/kits/ops/op-helage.js

@@ -25,7 +25,7 @@
 //   parts at once].
 // - Module SBL-X “藏锋” "生命值低于50%时，获得25%的庇护" (a display trait part; the effect is the hidden talent part hp_ratio /
 //   damage_resistance, merged into talent 0's blackboard): below hp_ratio of his max HP the physical and arts damage he takes
-//   ×(1 − damage_resistance) (as 宴's elite module).
+//   ×(1 − damage_resistance) (as 宴's elite module) — 庇护, "同名效果取最高": the shared effect (tier1.js holdProtect).
 // - Module SBL-Y “热的雪” "被击倒时不撤退且回复30%生命（单次部署只触发1次）" (trait bb hp_ratio): the first lethal blow of a
 //   deployment leaves him on the field at hp_ratio of his max HP (a kit saver, priority −50 as 斯卡蒂's module).
 // - S1 新月 (AUTO, attack SP, DEFAULT): the next attack at atk_scale × ATK, twice (Skill clip: two OnAttack).
@@ -33,7 +33,7 @@
 // - S3 满月 (MANUAL, time SP, data ACTIVE_RANGE on the running 1-1 + 1): `duration` s — ATK +atk, attack range +1 tile
 //   forward (ability_range_forward_extend), up to attack@max_target targets at once; back to 1-1 after.
 
-import { num, traitBb, skillRec, toggleBuff, up, onHitOn } from '../shared/tier1.js';
+import { num, traitBb, skillRec, toggleBuff, up, onHitOn, holdProtect, PROTECT_TICK_HOLD } from '../shared/tier1.js';
 
 const S1 = 'skchr_helage_1';
 const S2 = 'skchr_helage_2';
@@ -89,12 +89,13 @@ export default {
         } },
       ],
       install(battle, unit) {
-        // SBL-X “藏锋”: 生命值低于50%时，获得25%的庇护 (physical and arts damage taken)
+        // SBL-X “藏锋”: 生命值低于50%时，获得25%的庇护 — the shared 庇护 (holdProtect: the strongest of every source holds),
+        // refreshed every tick and at each hit on him while he is below
         const dr = num(t0.damage_resistance), drBelow = num(t0.hp_ratio);
         if (dr > 0 && drBelow > 0) {
-          onHitOn(battle, unit, ({ dmg }) => {
-            if ((dmg.type === 'phys' || dmg.type === 'arts') && unit.hpRatio < drBelow) dmg.mul *= 1 - dr;
-          });
+          const keep = () => { if (up(unit) && unit.hpRatio < drBelow) holdProtect(battle, unit, dr, PROTECT_TICK_HOLD, unit); };
+          battle.on('tick', keep, { owner: unit });
+          onHitOn(battle, unit, keep);
         }
         // SBL-Y “热的雪”: 被击倒时不撤退且回复30%生命（单次部署只触发1次）
         const rise = num(tb.hp_ratio);