Initial minecraft-builder-mcp prototype and Gothic hall build

mvnw

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+set -euo pipefail
+project_root="$(cd -- "$(dirname -- "$0")" && pwd)"
+tool_cache="${MCB_TOOL_CACHE:-${XDG_CACHE_HOME:-$HOME/.cache}/minecraft-builder-mcp}"
+if [[ ! -x "$tool_cache/apache-maven-3.9.11/bin/mvn" || ! -x "$tool_cache/jdk-25.0.2/bin/java" ]]; then
+  MCB_TOOL_CACHE="$tool_cache" python3 "$project_root/scripts/bootstrap-tools.py"
+fi
+export JAVA_HOME="${MCB_JAVA_HOME:-$tool_cache/jdk-25.0.2}"
+exec "$tool_cache/apache-maven-3.9.11/bin/mvn" "$@"