Add Feb changelog

Author: jlin27

fern/docs/changelog/2026-02-28.mdx

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+---
+tags: []
+---
+
+#### 📣 Announcements
+
+- **Cross-Chain API (Private Beta)**: The Cross-Chain API is now live in private beta. [Learn more and sign up](https://0x.org/products/cross-chain).
+
+#### New Chains
+
+- **HyperEVM:** Now supported in Swap API.
+- **Tempo:** Now supported in Swap API.
+
+#### New Liquidity Sources
+
+- **Arbitrum:** Added WooFi v2.
+- **Avalanche:** Added WooFi v2.
+- **Base:** Added DODO v2, ElfomoFi, Metric, and WooFi v2.
+- **BSC:** Added WooFi v2.
+- **Ethereum:** Added Ekubo v3.
+- **Linea:** Added WooFi v2.
+- **Mantle:** Added WooFi v2.
+- **Optimism:** Added WooFi v2.
+- **Polygon:** Added ApeSwap, WooFi v2.
+- **Sonic:** Added WooFi v2.
+- **HyperEVM:** Added Hybra, Kittenswap.
+
+#### Chores
+
+- Expanded Uniswap v4 support:
+  - Added Temple hook (Base).
+  - Added Clanker hook (BSC).
+  - Added Pancake Infinity.
+  - Added Liquid Launch.