feat: populate note files with problem descriptions and code stubs

Add populate-notes.mjs that fetches problem descriptions and
Python/C++ code stubs from LeetCode's GraphQL API. Populated
all 197 NeetCode 150 note files with:
- Problem description (examples, constraints)
- Python code stub (function signature)
- C++ code stub (function signature + includes)

API responses cached in leetcode/.cache/leetcode/ for instant re-runs.

org/study_deck_02/dsa/1-d-dynamic-programming/0213-house-robber-ii.org

@@ -1,18 +1,64 @@
 #+PROPERTY: STUDY_DECK_02
 * TODO 0213. House Robber II :medium:
 :PROPERTIES:
-:NEETCODE: [[file:../../roadmap.org::*0213. House Robber II][Roadmap]]
+:NEETCODE: [[file:../../roadmap.org::*0213. House Robber II][0213. House Robber II]]
 :END:
 
+You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed. All houses at this place are *arranged in a circle.* That means the first house is the neighbor of the last one. Meanwhile, adjacent houses have a security system connected, and it will automatically contact the police if two adjacent houses were broken into on the same night.
+
+Given an integer array ~nums~ representing the amount of money of each house, return /the maximum amount of money you can rob tonight *without alerting the police*/.
+
+*Example 1:*
+
+
+#+begin_src
+Input: nums = [2,3,2]
+Output: 3
+Explanation: You cannot rob house 1 (money = 2) and then rob house 3 (money = 2), because they are adjacent houses.
+#+end_src
+
+
+*Example 2:*
+
+
+#+begin_src
+Input: nums = [1,2,3,1]
+Output: 4
+Explanation: Rob house 1 (money = 1) and then rob house 3 (money = 3).
+Total amount you can rob = 1 + 3 = 4.
+#+end_src
+
+
+*Example 3:*
+
+
+#+begin_src
+Input: nums = [1,2,3]
+Output: 3
+#+end_src
+
+
+*Constraints:*
+
+ - ~1 <= nums.length <= 100~
+
+ - ~0 <= nums[i] <= 1000~
+
 ** TODO Approach
 Write your approach here.
 
 ** TODO Python
 #+begin_src python
-
+class Solution:
+    def rob(self, nums: List[int]) -> int:
 #+end_src
 
 ** TODO C++
 #+begin_src cpp
-
+class Solution {
+public:
+    int rob(vector<int>& nums) {
+        
+    }
+};
 #+end_src