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Adds integration_test.go with four test functions that exercise all major IRC features using real TCP connections: TestIntegrationTwoClients: sequential two-client test covering NICK/USER registration, JOIN, PRIVMSG (channel + DM), NOTICE (channel + DM), TOPIC (set/get/lock/unlock), MODE (query, +m, +v, -t/+t), NAMES, LIST, WHO, WHOIS (with channels), LUSERS, NICK change (with relay), duplicate NICK, KICK (with relay + reason), KICK non-op error, PING/PONG, unknown command, MOTD, AWAY (set/clear/RPL_AWAY on DM), PASS post-registration, PART (with reason + relay), PART non-existent channel, user MODE query, multi-channel messaging, and QUIT (with relay). TestIntegrationModeSecret: verifies +s mode can be set and is reflected in MODE queries. TestIntegrationModeModerated: verifies +m blocks non-voiced users and +v enables sending in moderated channels. TestIntegrationThirdClientObserver: verifies three-client channel message fanout. closes #97