Initial Fabric mod for chat-based quiz answer submission

Hooks ServerMessageEvents.ALLOW_CHAT_MESSAGE to intercept chat while the
music_quiz datapack is in answer-accepting state (init=5 on objective
'main'). Intercepted messages are forwarded to mq:answer/submit with the
player's UUID context and the chat broadcast is suppressed so the answer
stays hidden from other players. Outside that state chat passes through
normally.

Target: Minecraft 1.21.6+, Java 21, Fabric Loader 0.16+, Fabric API.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.12-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists