Update README with LeetCode Daily Challenge

Author: jeremymanning

README.md

@@ -23,6 +23,7 @@ This means you'll always find an AI-generated solution to compare with or learn
 | February 1, 2026 | [3010](https://leetcode.com/problems/divide-an-array-into-subarrays-with-minimum-cost-i/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/3010) | 🟢 Easy |
 | February 2, 2026 | [3013](https://leetcode.com/problems/divide-an-array-into-subarrays-with-minimum-cost-ii/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/3013) | 🔴 Hard |
 | February 3, 2026 | [3637](https://leetcode.com/problems/trionic-array-i/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/3637) | 🟢 Easy |
+| February 4, 2026 | [3640](https://leetcode.com/problems/trionic-array-ii/description/?envType=daily-question) | [Click here](https://github.com/ContextLab/leetcode-solutions/tree/main/problems/3640) | 🔴 Hard |
 
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