chore(conductor): Add missing index.md and metadata.json to new tracks

conductor/tracks/mma_dashboard_visualization_overhaul/index.md

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+# MMA Dashboard Visualization Overhaul
+
+Overhauls the GUI dashboard to display a visual DAG, live streams, and track browsers.
+
+### Navigation
+- [Specification](./spec.md)
+- [Implementation Plan](./plan.md)

conductor/tracks/mma_dashboard_visualization_overhaul/metadata.json

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+{
+  "id": "mma_dashboard_visualization_overhaul",
+  "title": "MMA Dashboard Visualization Overhaul",
+  "status": "planned",
+  "created_at": "2026-02-27T19:20:00.000000"
+}