Add thesis image to Luke Howard PhD defense post

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: aneeshcs

content/post/luke-howard-phd-defense-2026/index.md

@@ -13,6 +13,8 @@ Congratulations to **Lucas (Luke) Howard** on defending his PhD dissertation tod
 
 **Location:** SEEC N128
 
+![Thesis overview](thesis_image.png)
+
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 **Abstract**