Add optional Adanos market sentiment tool

[alexander-schneider]

Summary

• add an optional adanosMarketSentiment AI SDK tool for equity-linked markets
• wire the tool into Polyseer's research agents as directional context for ticker-specific follow-up research
• document the optional env vars and add unit coverage for ticker normalization and payload mapping

Notes

• fail-open by design: if ADANOS_API_KEY is not set, Polyseer behaves exactly as before
• the tool is intended only for public-company / stock / earnings / ticker-linked catalysts, not for generic prediction markets
• also normalizes self-hosted Valyu SDK deep-search results to satisfy existing TypeScript expectations

Validation

• npm run test:unit
• npx tsc --noEmit
• git diff --check

Known upstream issue

• npm run lint currently fails in this repo due to an existing ESLint config crash (Converting circular structure to JSON), unrelated to this patch

[vercel]

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