test: 测试矩阵扩至 161 项（深度审计 + 5 处缺陷修复）

新增测试矩阵（12 文件 / 161 cases）：
- rng 12 / data 18 / pcgen+cultivation 20 / economy 12 / combat+missions 24
- marriage+diplomacy 13 / events 12 / world+lifecycle 8（含镜像一致）/ save 4+5 / audit 8

审计带出并修复的真实缺陷：
1. Rng.pick 空数组未报错（防空白数组进而崩溃难查）
2. combatPowerOf 未应用功法悟道品阶战力加成（0.1.2 设计缺口）
3. 重伤者即使不代表伤状态仍按满速修炼（health 进修炼公式）
4. 寡妇/鳏夫无法再婚：候选列表放着人执行层却拒婚（spouseId 死旧契约）
5. isWidowed 参数契约陷阱：传 id 静默 false（升级接受 Character|Id 双签名）

src/renderer/game/engine/systems/diplomacy.ts

@@ -62,7 +62,7 @@ export function marryNpcFamily(w: World, npcId: string): boolean {
   const eligible = w
     .aliveMembers()
     .filter((c) => w.ageOf(c) >= 16 && w.ageOf(c) <= 46 && c.state !== 'expedition')
-    .filter((c) => !c.spouseId)
+    .filter((c) => !c.spouseId || w.isWidowed(c))
   if (eligible.length === 0) return false
   const npcDef = npcById(npcId)
   const candidate = w.rng.pick(eligible)
@@ -79,7 +79,9 @@ export function marryNpcFamily(w: World, npcId: string): boolean {
 export function arrangeWedding(w: World, aId: string, bId: string): boolean {
   const a = w.memberById(aId)
   const b = w.memberById(bId)
-  if (!a.alive || !b.alive || a.spouseId || b.spouseId) return false
+  if (!a.alive || !b.alive) return false
+  if (a.spouseId && !w.isWidowed(a)) return false
+  if (b.spouseId && !w.isWidowed(b)) return false
   if (a.gender === b.gender) return false
   if (a.fatherId === b.fatherId && a.fatherId) return false
   if (a.motherId === b.motherId && a.motherId) return false