Add DeleteStreamsForSessionAsync to ISseEventStreamStore
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评估
调研方向
从 ISseEventStreamStore 开始，跟踪其实现和调用方，尤其是通过 RunSessionHandler 终止会话的流程。添加所请求的异步删除操作，并验证给定会话的所有流及关联事件都已移除，同时支持取消操作。
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描述
Is your feature request related to a problem? Please describe.
When an MCP session ends, the SSE event streams stored by ISseEventStreamStore for that session are not proactively cleaned up. They persist until cache expiration removes them. This wastes storage, especially in high-throughput scenarios with many short-lived sessions.
Describe the solution you'd like
Add a DeleteStreamsForSessionAsync(string sessionId, CancellationToken) method to ISseEventStreamStore that deletes all stored streams and their associated events for a given session.
Describe alternatives you've considered
An alternative is to rely solely on cache expiration to keep resource consumption low. Since it is relatively easy to catch session terminations (with RunSessionHandler), it seems reasonable to provide a means to delete the streams for this session since they are known to be no longer needed.
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