fix: prevent NPE crash from OkHttp executor shutdown race#217
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Cancel in-flight calls and await executor termination before shutdown to prevent NullPointerException when OkHttp threads are still processing WebSocket close frames. Also fixes leaked OkHttpClient in swapClientAndReconnect().
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Summary
safeShutdownClient()helper toHttpClientFactorythat cancels in-flight calls, evicts connections, and awaits executor termination before shutdown — preventing NPE when OkHttp threads are still processing WebSocket close framesshutdown()+evictAll()calls inRelayProber(2 locations) with the safe helperOkHttpClientinRelayPool.swapClientAndReconnect()by cleaning up the old client after creating the new oneTest plan
swapClientAndReconnect()— no thread leaks or crashes