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/0198-house-robber.org

@@ -1,18 +1,56 @@
 #+PROPERTY: STUDY_DECK_02
 * TODO 0198. House Robber :medium:
 :PROPERTIES:
-:NEETCODE: [[file:../../roadmap.org::*0198. House Robber][Roadmap]]
+:NEETCODE: [[file:../../roadmap.org::*0198. House Robber][0198. House Robber]]
 :END:
 
+You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stopping you from robbing each of them is that adjacent houses have security systems 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 = [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 2:*
+
+
+#+begin_src
+Input: nums = [2,7,9,3,1]
+Output: 12
+Explanation: Rob house 1 (money = 2), rob house 3 (money = 9) and rob house 5 (money = 1).
+Total amount you can rob = 2 + 9 + 1 = 12.
+#+end_src
+
+
+*Constraints:*
+
+ - ~1 <= nums.length <= 100~
+
+ - ~0 <= nums[i] <= 400~
+
 ** 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