chore(conductor): Add index.md to new tracks, archive completed/superseded tracks

- Add index.md to mma_pipeline_fix, simulation_hardening, context_token_viz
- Archive documentation_refresh_20260224 (superseded by 08e003a rewrite)
- Archive robust_live_simulation_verification (context distilled into
  simulation_hardening_20260301 spec)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

conductor/tracks/context_token_viz_20260301/index.md

@@ -0,0 +1,5 @@
+# Track context_token_viz_20260301 Context
+
+- [Specification](./spec.md)
+- [Implementation Plan](./plan.md)
+- [Metadata](./metadata.json)

conductor/tracks/mma_pipeline_fix_20260301/index.md

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+# Track mma_pipeline_fix_20260301 Context
+
+- [Specification](./spec.md)
+- [Implementation Plan](./plan.md)
+- [Metadata](./metadata.json)

conductor/tracks/simulation_hardening_20260301/index.md

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+# Track simulation_hardening_20260301 Context
+
+- [Specification](./spec.md)
+- [Implementation Plan](./plan.md)
+- [Metadata](./metadata.json)