feedback2 WG: tests for 余烬's 禁疗 and the 3 s 隐匿 window (embers included); flag list, DESIGN §5 / §21.4 and SIM.md follow

server/sim/buffs.js

@@ -31,7 +31,9 @@ export const MUL_KEYS = Object.freeze([
 /**
  * Boolean flag keys (OR). `taunt` is also accepted as a numeric mod. `liftoff` = 起飞 of an ally (蒂比's skills): blocks
  * no ground enemy (Battle._blockerFor), 对地规避 against ground enemies (targeting.js evadesGround); it stays a ground
- * unit on its tile (`unit.ground` unchanged).
+ * unit on its tile (`unit.ground` unchanged). `noHeal` = no heal from another unit (and no heal pick of one); `healFree`
+ * = 禁疗 that also stops the unit's own heals (damage.js heal: only an HP-regen attribute and a heal that "无视禁疗" pass —
+ * 史尔特尔's 余烬, which sets both). `stealthOff` = an enemy 隐匿 source switched off after a block (Battle._stealthSwitch).
  */
 export const FLAG_KEYS = Object.freeze([
   'stun', 'freeze', 'sleep', 'silence', 'disarm', 'stealth', 'invulnerable', 'unblockable', 'levitate', 'fear',
@@ -39,7 +41,7 @@ export const FLAG_KEYS = Object.freeze([
   'noBlock', 'tremble', 'hitCount', 'hitCountArts', 'attract', 'float', 'noDisplace', 'isolated', 'camou', 'liftoff',
   // 自缚 (the unit's own immobility: 守墓石像's 转换模式, the 自缚 leaders) beside its `noMove` — 束缚 sets noMove too, and
   // only 自缚 makes a unit "不视为可达目标" for 余 S2's teleport (PRTS 余 S2 备注)
-  'selfBound',
+  'selfBound', 'healFree', 'stealthOff',
 ]);
 
 /**