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/2-d-dynamic-programming/0010-regular-expression-matching.org

@@ -1,18 +1,74 @@
 #+PROPERTY: STUDY_DECK_02
 * TODO 0010. Regular Expression Matching :hard:
 :PROPERTIES:
-:NEETCODE: [[file:../../roadmap.org::*0010. Regular Expression Matching][Roadmap]]
+:NEETCODE: [[file:../../roadmap.org::*0010. Regular Expression Matching][0010. Regular Expression Matching]]
 :END:
 
+Given an input string ~s~ and a pattern ~p~, implement regular expression matching with support for ~'.'~ and ~'*'~ where:
+
+ - ~'.'~ Matches any single character.​​​​
+
+ - ~'*'~ Matches zero or more of the preceding element.
+
+Return a boolean indicating whether the matching covers the entire input string (not partial).
+
+*Example 1:*
+
+
+#+begin_src
+Input: s = "aa", p = "a"
+Output: false
+Explanation: "a" does not match the entire string "aa".
+#+end_src
+
+
+*Example 2:*
+
+
+#+begin_src
+Input: s = "aa", p = "a*"
+Output: true
+Explanation: '*' means zero or more of the preceding element, 'a'. Therefore, by repeating 'a' once, it becomes "aa".
+#+end_src
+
+
+*Example 3:*
+
+
+#+begin_src
+Input: s = "ab", p = ".*"
+Output: true
+Explanation: ".*" means "zero or more (*) of any character (.)".
+#+end_src
+
+
+*Constraints:*
+
+ - ~1 <= s.length <= 20~
+
+ - ~1 <= p.length <= 20~
+
+ - ~s~ contains only lowercase English letters.
+
+ - ~p~ contains only lowercase English letters, ~'.'~, and ~'*'~.
+
+ - It is guaranteed for each appearance of the character ~'*'~, there will be a previous valid character to match.
+
 ** TODO Approach
 Write your approach here.
 
 ** TODO Python
 #+begin_src python
-
+class Solution:
+    def isMatch(self, s: str, p: str) -> bool:
 #+end_src
 
 ** TODO C++
 #+begin_src cpp
-
+class Solution {
+public:
+    bool isMatch(string s, string p) {
+        
+    }
+};
 #+end_src