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/0130-surrounded-regions.org

@@ -1,18 +1,63 @@
 #+PROPERTY: STUDY_DECK_02
 * TODO 0130. Surrounded Regions :medium:
 :PROPERTIES:
-:NEETCODE: [[file:../../roadmap.org::*0130. Surrounded Regions][Roadmap]]
+:NEETCODE: [[file:../../roadmap.org::*0130. Surrounded Regions][0130. Surrounded Regions]]
 :END:
 
+You are given an ~m x n~ matrix ~board~ containing *letters* ~'X'~ and ~'O'~, *capture regions* that are *surrounded*:
+
+ - *Connect*: A cell is connected to adjacent cells horizontally or vertically.
+
+ - *Region*: To form a region *connect every* ~'O'~ cell.
+
+ - *Surround*: A region is surrounded if none of the ~'O'~ cells in that region are on the edge of the board. Such regions are *completely enclosed *by ~'X'~ cells.
+
+To capture a *surrounded region*, replace all ~'O'~s with ~'X'~s *in-place* within the original board. You do not need to return anything.
+
+*Example 1:*
+
+*Input:* board = [["X","X","X","X"],["X","O","O","X"],["X","X","O","X"],["X","O","X","X"]]
+
+*Output:* [["X","X","X","X"],["X","X","X","X"],["X","X","X","X"],["X","O","X","X"]]
+
+*Explanation:*
+
+In the above diagram, the bottom region is not captured because it is on the edge of the board and cannot be surrounded.
+
+*Example 2:*
+
+*Input:* board = [["X"]]
+
+*Output:* [["X"]]
+
+*Constraints:*
+
+ - ~m == board.length~
+
+ - ~n == board[i].length~
+
+ - ~1 <= m, n <= 200~
+
+ - ~board[i][j]~ is ~'X'~ or ~'O'~.
+
 ** TODO Approach
 Write your approach here.
 
 ** TODO Python
 #+begin_src python
-
+class Solution:
+    def solve(self, board: List[List[str]]) -> None:
+        """
+        Do not return anything, modify board in-place instead.
+        """
 #+end_src
 
 ** TODO C++
 #+begin_src cpp
-
+class Solution {
+public:
+    void solve(vector<vector<char>>& board) {
+        
+    }
+};
 #+end_src