Wire SimUniverse control plane and metrics exporter

[flamehaven01]

Summary

• add a SQLite-backed SimUniverse run registry plus a lightweight control plane API that drives the Stage-5 → trust summary → Omega merge loop and records omega/simuniverse metrics per run
• provide a GitOps-friendly sync script and a Prometheus exporter so trust summaries are patched into the ASDP registry and surfaced as MUH/Faizal/Omega gauges
• document the new architecture pillars and extend the regression suite (registry, control-plane orchestration, exporter) alongside a tiny FastAPI/PyYAML stub to keep CI offline friendly

Testing

• pytest

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Codex Task