update platform_extensions snapshot for summarize

Author: Douwe Osinga

crates/goose/src/agents/snapshots/goose__agents__prompt_manager__tests__all_platform_extensions.snap

@@ -94,6 +94,9 @@ and file sizes. When you need to search, prefer rg which correctly respects giti
 content. Then use cat or sed to gather the context you need, always reading before editing.
 Use write and edit to efficiently make changes. Test and verify as appropriate.
 
+## summarize
+
+
 ## summon
 
 ### Instructions