add april changelog

fern/docs/changelog/2026-04-30.mdx

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+#### New Liquidity Sources
+
+- **Arbitrum:** Added Fluid, Printr, and Renegade.
+- **Avalanche:** Added Printr.
+- **Base:** Added Aerodrome V3, Fluid, LunarBase, Nabla, Printr, a Clanker V2 fork (Uniswap V4), Doppler Rehype (Uniswap V4), and Uniswap Stable Hook (Uniswap V4).
+- **BSC:** Added Fluid, SmoothyV1, and Printr.
+- **Ethereum:** Added Fluid, Printr, and Renegade darkpool.
+- **Mantle:** Added Printr.
+- **Optimism:** Added Velodrome V3 and Uniswap V2.
+- **Polygon:** Added Fluid.
+- **Tempo:** Added Uniswap V2, V3, and V4 support.
+
+#### New Feature
+
+- **0x Agent Skill**: New agent skill that gives AI coding agents full knowledge of the 0x APIs with a single command. Once installed, agents knows every endpoint, authentication method, and integration pattern for token swaps. [Learn more](https://docs.0x.org/docs/introduction/develop-with-ai/agent-skills)
+- **`slippagePpm` in Swap and Gasless API**: Sub-BPS slippage precision is now supported via a new `slippagePpm` parameter (0–1,000,000). This is mutually exclusive with `slippageBps` — existing defaults and validations are unchanged. See more in [API Reference](https://docs.0x.org/api-reference/openapi-json/swap/allowanceholder-getprice).
+
+#### Bug Fixes
+
+- Improve gas accuracy for Abstract.
+- Improve accuracy with Aave V3.