Clean repo for open source release

Remove build artifacts, dev tool configs, unused dependencies,
and third-party source dumps. Add proper README, update .gitignore,
clean up Makefile.

build-with-java17.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+# TiedUp! Build Helper Script
+# Forces the use of Java 17 for Gradle builds (required for Forge 1.20.1)
+#
+# Usage:
+#   ./build-with-java17.sh           # Run default build
+#   ./build-with-java17.sh clean     # Clean build
+#   ./build-with-java17.sh runClient # Run client
+
+# Set Java 17 as JAVA_HOME for this script
+export JAVA_HOME=/usr/lib/jvm/java-17-openjdk
+
+# Print Java version for confirmation
+echo "Using Java version:"
+$JAVA_HOME/bin/java -version
+
+echo ""
+echo "Running Gradle with Java 17..."
+echo "Command: ./gradlew $@"
+echo ""
+
+# Run Gradle with all passed arguments
+./gradlew "$@"