v0.6.0 — ROS1 support, MCP server & public scoreboard

• ROS1 .bag support via pip install bagx[ros1] (verified on TUM VI, EuRoC)
• bagx mcp stdio MCP server (eval_bag / list_topics / detect_anomalies / compare_bags / query_messages)
• Public scoreboard: 26 datasets scored with reproduction commands
• bagx-action composite GitHub Action and CI dogfooding