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/greedy/0763-partition-labels.org

@@ -1,18 +1,58 @@
 #+PROPERTY: STUDY_DECK_02
 * TODO 0763. Partition Labels :medium:
 :PROPERTIES:
-:NEETCODE: [[file:../../roadmap.org::*0763. Partition Labels][Roadmap]]
+:NEETCODE: [[file:../../roadmap.org::*0763. Partition Labels][0763. Partition Labels]]
 :END:
 
+You are given a string ~s~. We want to partition the string into as many parts as possible so that each letter appears in at most one part. For example, the string ~"ababcc"~ can be partitioned into ~["abab", "cc"]~, but partitions such as ~["aba", "bcc"]~ or ~["ab", "ab", "cc"]~ are invalid.
+
+Note that the partition is done so that after concatenating all the parts in order, the resultant string should be ~s~.
+
+Return /a list of integers representing the size of these parts/.
+
+*Example 1:*
+
+
+#+begin_src
+Input: s = "ababcbacadefegdehijhklij"
+Output: [9,7,8]
+Explanation:
+The partition is "ababcbaca", "defegde", "hijhklij".
+This is a partition so that each letter appears in at most one part.
+A partition like "ababcbacadefegde", "hijhklij" is incorrect, because it splits s into less parts.
+#+end_src
+
+
+*Example 2:*
+
+
+#+begin_src
+Input: s = "eccbbbbdec"
+Output: [10]
+#+end_src
+
+
+*Constraints:*
+
+ - ~1 <= s.length <= 500~
+
+ - ~s~ consists of lowercase English letters.
+
 ** TODO Approach
 Write your approach here.
 
 ** TODO Python
 #+begin_src python
-
+class Solution:
+    def partitionLabels(self, s: str) -> List[int]:
 #+end_src
 
 ** TODO C++
 #+begin_src cpp
-
+class Solution {
+public:
+    vector<int> partitionLabels(string s) {
+        
+    }
+};
 #+end_src