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/graphs/0695-max-area-of-island.org

@@ -1,18 +1,59 @@
 #+PROPERTY: STUDY_DECK_02
 * TODO 0695. Max Area of Island :medium:
 :PROPERTIES:
-:NEETCODE: [[file:../../roadmap.org::*0695. Max Area of Island][Roadmap]]
+:NEETCODE: [[file:../../roadmap.org::*0695. Max Area of Island][0695. Max Area of Island]]
 :END:
 
+You are given an ~m x n~ binary matrix ~grid~. An island is a group of ~1~'s (representing land) connected *4-directionally* (horizontal or vertical.) You may assume all four edges of the grid are surrounded by water.
+
+The *area* of an island is the number of cells with a value ~1~ in the island.
+
+Return /the maximum *area* of an island in /~grid~. If there is no island, return ~0~.
+
+*Example 1:*
+
+
+#+begin_src
+Input: grid = [[0,0,1,0,0,0,0,1,0,0,0,0,0],[0,0,0,0,0,0,0,1,1,1,0,0,0],[0,1,1,0,1,0,0,0,0,0,0,0,0],[0,1,0,0,1,1,0,0,1,0,1,0,0],[0,1,0,0,1,1,0,0,1,1,1,0,0],[0,0,0,0,0,0,0,0,0,0,1,0,0],[0,0,0,0,0,0,0,1,1,1,0,0,0],[0,0,0,0,0,0,0,1,1,0,0,0,0]]
+Output: 6
+Explanation: The answer is not 11, because the island must be connected 4-directionally.
+#+end_src
+
+
+*Example 2:*
+
+
+#+begin_src
+Input: grid = [[0,0,0,0,0,0,0,0]]
+Output: 0
+#+end_src
+
+
+*Constraints:*
+
+ - ~m == grid.length~
+
+ - ~n == grid[i].length~
+
+ - ~1 <= m, n <= 50~
+
+ - ~grid[i][j]~ is either ~0~ or ~1~.
+
 ** TODO Approach
 Write your approach here.
 
 ** TODO Python
 #+begin_src python
-
+class Solution:
+    def maxAreaOfIsland(self, grid: List[List[int]]) -> int:
 #+end_src
 
 ** TODO C++
 #+begin_src cpp
-
+class Solution {
+public:
+    int maxAreaOfIsland(vector<vector<int>>& grid) {
+        
+    }
+};
 #+end_src