Quant: CLI entry point + data timer

Systemd timer for daily data refresh + one-time historical backfill.

Files: Omni/Fund/Quant.hs (CLI entry point)

Deliverables:

• CLI with subcommands: quant backfill, quant refresh, quant eval, quant signals
• backfill — fetch 5 years of daily prices for entire universe, cache locally
• refresh — fetch latest bars since last cached date
• eval — run the eval suite, print results
• signals — compute current signals, write to /var/fund/quant/signals.json
• Systemd timer via manifest (daily, after market close ~5pm ET)
• Create /var/fund/quant/ directory structure

This is the main binary that ties everything together for Phase 1.