Fix safe-output naming: use snake_case consistently in codegen-agentic-fix.md

Agent-Logs-Url: https://github.com/github/copilot-sdk-java/sessions/b6a75ef1-fd8c-4a1b-ac77-589593f6dc9e

Co-authored-by: edburns <75821+edburns@users.noreply.github.com>

Author: Copilot

.github/workflows/codegen-agentic-fix.md

@@ -33,9 +33,9 @@ tools:
     toolsets: [context, repos]
 
 safe-outputs:
-  push-to-pull-request-branch:
+  push_to_pull_request_branch:
     max: 3
-  add-comment:
+  add_comment:
     target: "*"
     max: 5
   noop: