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/chess_char_6_11-mlyss.js

@@ -5,6 +5,7 @@ import {
   num, bv, tbb, tdesc, moduleBb, parseN, live, isTok, onDefaultSkill, selectedSkill, AROUND8, N4, bstate, bestTile,
   pullToward,
 } from '../shared/tier6.js';
+import { holdProtect } from '../shared/tier1.js';
 
 /** 莱茵生命 (character_table groupId "rhine") members of this season's pool (checked against the official table). */
 const RHINE = new Set(['char_108_silent', 'char_128_plosis', 'char_202_demkni', 'char_249_mlyss', 'char_1047_halo2']);
@@ -139,7 +140,9 @@ function mlyss(bb, chess, def) {
             const ranged = !!(m && m.ranged);
             t.profile.hits = on && ranged && live(t) ? t.mem.mlyssHits * 2 : t.mem.mlyssHits; // 二连击
             if (on && m && !ranged && live(t)) {
-              battle.addBuff(t, { key: 'mlyss:eco', duration: 0.4, refresh: 'replace', visible: true, mods: { hpRegenRatio: regen, physTakenMul: 1 - dr, artsTakenMul: 1 - dr } });
+              battle.addBuff(t, { key: 'mlyss:eco', duration: 0.4, refresh: 'replace', visible: true, mods: { hpRegenRatio: regen } });
+              // "获得15%的庇护": the shared 庇护 (holdProtect — 同名效果取最高 with every other source)
+              holdProtect(battle, t, dr, 0.4, unit);
             }
           }
         }, { owner: unit });