fix: 让哈洛德S2在友方只有元素损伤时也能开启

docs/history/0.2.3.md

@@ -479,3 +479,15 @@ imports and typecheck pass. This round changes no production UI and does not rer
   the `roster`, `bonds`, `fields`, `matches`, `standins` families are unchanged.
 - **Contracts updated:** design/engine.md, SIM.md (cabin), design/client.md, design/network.md, META.md and PLAYING.md
   (local identity recovery and handshake).
+
+
+### 28.28 Harold S2 opens for element healing at full HP — `sim/skills.js _defaultCondition`
+
+- Cause: the normal wandermedic heal already selected full-HP allies with element damage, but DEFAULT checked HP
+  injury alone and never opened S2 for that heal. The basic strategy opens a ready skill before a needed heal
+  (PRTS [卫戍协议/帮助](https://prts.wiki/w/卫戍协议/帮助), 技能操作); wandermedic recovery is documented in SIM §8.
+- The condition now uses the same `heal.elementHealRatio` option as the ordinary healer's selector. A physician
+  still requires HP injury. SP, silence, operation cooldown, noHeal and explicit HP-threshold strategies are unchanged;
+  the 0.2.3 mixed enemy/ally and special-target conditions remain intact. No new [ASSUMED] rule.
+- Regression: `test/content/harold-trigger.test.js`, both forms and five element gauges, ordinary healing before
+  full SP, no need, HP injury, out of range, noHeal, silence, initial cooldown and other strategies.