docs: record external market data research sources

[proerror77]

Summary

Adds a durable research-data source inventory for Monday covering:

• Polymarket 1-second/full-L2 and large public research datasets
• Binance official historical archives and Tardis incremental L2
• Bybit official historical data and Tardis incremental L2
• OKX official historical L2 and Tardis
• multi-venue research guidance and provenance requirements
• a recommended bootstrap -> large-scale history -> production-truth workflow

Important boundary

This is documentation only. It explicitly does not claim production connector support or governed Data Mission capability. Monday live collectors remain production/evidence truth for event ordering, latency, fills, and validation.

Immediate research implication

Monday can begin microstructure and execution research now using external history instead of waiting to accumulate sufficient self-captured history. Free bootstrap paths include the Polymarket HF sample, OKX official historical L2, Binance public archives, and first-day-of-month Tardis samples.

Validation

Documentation-only change; no runtime/collector behavior changed.

[coderabbitai]

Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: a60a9bbc-3019-415f-9b88-a1b356a254b4

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