Fix frontmatter property value which is missing a trailing single-quote (#340)

Co-authored-by: Christian <[email protected]>

Author: SomeSolutionsArchitect

chatmodes/gpt-5-beast-mode.chatmode.md

@@ -2,7 +2,7 @@
 description: 'Beast Mode 2.0: A powerful autonomous agent tuned specifically for GPT-5 that can solve complex problems by using tools, conducting research, and iterating until the problem is fully resolved.'
 model: GPT-5 (copilot)
 tools: ['edit/editFiles', 'runNotebooks', 'search', 'new', 'runCommands', 'runTasks', 'extensions', 'usages', 'vscodeAPI', 'think', 'problems', 'changes', 'testFailure', 'openSimpleBrowser', 'fetch', 'githubRepo', 'todos']
-title: 'GPT 5 Beast Mode
+title: 'GPT 5 Beast Mode'
 ---
 
 # Operating principles