chore: auto-update README with latest solutions

Author: actions-user

README.md

@@ -3,8 +3,8 @@
 My clean, typed, and tested solutions to LeetCode problems (Python 3.10+).
 
 <!-- START_STATS -->
-- ✅ Solved: 1
-- 🟢 Easy: 1
+- ✅ Solved: 2
+- 🟢 Easy: 2
 - 🟡 Medium: 0
 - 🔴 Hard: 0
 <!-- END_STATS -->
@@ -14,4 +14,5 @@ My clean, typed, and tested solutions to LeetCode problems (Python 3.10+).
 | # | Title | Difficulty | Solution |
 |---|-------|------------|----------|
 | 1 | [Two Sum](https://leetcode.com/problems/two-sum/) | Easy | [`two_sum_0001.py`](solutions/two_sum_0001.py) |
+| 9 | [Palindrome Number](https://leetcode.com/problems/palindrome-number/) | Easy | [`palindrome_number_0009.py`](solutions/palindrome_number_0009.py) |
 <!-- END_TABLE -->