fix: add lockdown false to github tool config

The issue-triage example workflow uses lockdown: false to allow
reading issue content. Without it, lockdown mode filters content
and blocks get_issue calls.

Author: zircote

.github/workflows/flock-action.lock.yml

@@ -22,6 +22,7 @@ tools:
   edit:
   github:
     toolsets: [context, issues, pull_requests]
+    lockdown: false
   bash: [git, cat, jq]
 
 mcp-servers: