docs: register the issue #10 design in the research wiki

research-wiki/index.md

@@ -1,8 +1,8 @@
 # Research Wiki 索引
 
-> 自动生成，更新时间：2026-08-07 15:11 UTC
+> 自动生成，更新时间：2026-08-16 09:12 UTC
 
-## design (26)
+## design (28)
 - [2026-07-20-m1-core-design](designs/2026-07-20-m1-core-design.md) `design:2026-07-20-m1-core-design`
 - [2026-07-20-m2-distributed-design](designs/2026-07-20-m2-distributed-design.md) `design:2026-07-20-m2-distributed-design`
 - [2026-07-21-m25-resilience-design](designs/2026-07-21-m25-resilience-design.md) `design:2026-07-21-m25-resilience-design`
@@ -15,9 +15,11 @@
 - [2026-07-31-sampling-params-design](designs/2026-07-31-sampling-params-design.md) `design:2026-07-31-sampling-params-design`
 - [2026-08-06-governance-backend-error-design](designs/2026-08-06-governance-backend-error-design.md) `design:2026-08-06-governance-backend-error-design`
 - [2026-08-06-issue8-stall-budget-design](designs/2026-08-06-issue8-stall-budget-design.md) `design:2026-08-06-issue8-stall-budget-design`
+- [2026-08-16-issue10-error-body-retention-design](designs/2026-08-16-issue10-error-body-retention-design.md) `design:2026-08-16-issue10-error-body-retention-design`
 - [est_tokens 解耦: 拆分限流预扣与遥测用量兜底(issue #2)](designs/est-tokens-decoupling.md) `design:est-tokens-decoupling`
 - [GatewaySettings 装配校验补齐(第二轮)](designs/settings-invariants-round-2.md) `design:settings-invariants-round-2`
 - [GatewaySettings 跨字段不变量守卫的生效范围](designs/settings-invariant-guards.md) `design:settings-invariant-guards`
+- [HTTP 错误响应体留存(Issue #10)](designs/issue10-error-body-retention.md) `design:issue10-error-body-retention`
 - [M1 核心里程碑设计:公共签名冻结与治理栈落地](designs/m1-core-design.md) `design:m1-core-design`
 - [M2 分布式:Redis 治理后端+背压+Postgres 遥测+pricing+Embedding+压测 harness](designs/m2-distributed.md) `design:m2-distributed`
 - [M2.5 治理韧性: 半死源隔离与健康感知调度](designs/m25-resilience.md) `design:m25-resilience`