修复：AutoContextMemory 在 WebFlux/reactive 场景下的阻塞问题

[guslegend0510]

说明

修复 AutoContextMemory 在 WebFlux/reactive 执行链路中可能触发 .block() 阻塞 event-loop 的问题。

变更

• 将 compressIfNeededAsync() 暴露为 public，作为 reactive 场景的推荐入口
• AutoContextHook 直接调用异步压缩入口，避免额外调度干预
• 增加回归测试，验证可从非阻塞调度器正常调用异步压缩

测试

• mvn -s codex-maven-settings.xml -pl agentscope-extensions/agentscope-extensions-autocontext-memory -am "-Dtest=AutoContextMemoryTest,AutoContextHookTest" test

关联

• Closes [Bug]:AutoContextMemory calls block() during WebFlux reactive execution #1447

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[codecov]

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