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handleTopic did not verify that the requesting user was a member of the channel before allowing them to set a topic. Any authenticated user could set the topic on any channel they hadn't joined. Add an IsChannelMember check after resolving the channel and before calling executeTopic, mirroring the existing pattern in handleChannelMsg. Non-members now receive ERR_NOTONCHANNEL (442). Add TestTopicNonMember to verify the fix.