Add new Polymarket documentation (2026-02-17)

- Added 31 new documentation pages from llms.txt index
- Updated changelog and 4 existing pages
- New categories: polymarket-learn (FAQ, deposits, get-started, markets, trading)
- New API: get-positions-for-a-market
- New guide: builders examples

docs/polymarket-learn/FAQ/wen-token.md

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+> ## Documentation Index
+> Fetch the complete documentation index at: https://docs.polymarket.com/llms.txt
+> Use this file to discover all available pages before exploring further.
+
+# Does Polymarket Have a Token?
+
+**Polymarket does not have a token.**
+
+All trading and liquidity rewards are in USDC, a USD-pegged stablecoin.
+
+Polymarket has not announced plans for any airdrop or token generation event. Be wary of scams claiming airdrops, giveaways, etc.
+
+If in doubt, refer to official Polymarket communication channels:
+
+* Web: [https://polymarket.com](https://polymarket.com)
+* Twitter / X: [https://x.com/polymarket](https://x.com/polymarket)
+* Discord: [https://discord.gg/polymarket](https://discord.gg/polymarket)