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Add Katana (Japan stock screener) (#501)

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Co-authored-by: Wilson Freitas <wilson.freitas@gmail.com>
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@@ -725,6 +725,7 @@ A curated list of insanely awesome libraries, packages and resources for Quants
- [NeuPortal](https://neuportal.ai) - AI forecasting-accountability lab: every forecast is locked pre-event, Bitcoin-timestamped (OpenTimestamps), and Brier-scored against prediction markets in public.
- [AlphaAssay](https://alphaassay.com) - `REST` - Independent statistical assay office for trading signals and backtests: deflated Sharpe with cumulative trial accounting, probability of backtest overfitting (PBO/CPCV), leakage forensics, placebo tests against matched synthetic null worlds, and pre-registration with Merkle-anchored timestamps — deterministic, Ed25519-signed verdicts anyone can replay. Free demo; hosted API and MCP server. Methodology audit, not investment advice. [GitHub](https://github.com/alphaassay/mcp)
- [Market Posture Daily](https://marketpd.com) - Daily trend, regime, momentum and relative-strength data for ~90 crypto assets and US stocks/ETFs, with a cointegration pair screener. Free terminal + JSON API.
- [Katana](https://katanascreener.com) - Free Japan stock screener built on EDINET filings. 160+ fundamentals, custom formula metrics, Graham/Piotroski/Kiyohara presets. No sign-up.
- [Disclosed Capitol](https://www.disclosedcapitol.com/data-files/api) - US congressional and executive-branch stock trade disclosures API. STOCK Act filings plus OGE executive data (~6,743 transactions across 106 officials), with trade-level returns and alpha. Free tier: 500 credits, no card.