follow dev74_1, 1. 新增mg_dev74_1_plots.py图表脚本（范围与dev73_5一致：收敛历史/热点/加速比/耗时/参数扫描）; 2. mg_dev74_1_server.sh并入Step 6作图（PLOTS步骤）; 3. 更新AGENTS.md并入库dev74_1图表PNG; [opencode].
follow dev74_1, 1. 新增mg_dev74_1_plots.py图表脚本（范围与dev73_5一致：收敛历史/热点/加速比/耗时/参数扫描）; 2. mg_dev74_1_server.sh并入Step 6作图（PLOTS步骤）; 3. 更新AGENTS.md并入库dev74_1图表PNG; [opencode].