Update CHANGELOG.md

Author: cte

CHANGELOG.md

@@ -1,10 +1,19 @@
 # Roo Code Changelog
 
-## 3.26.0
-
-### Minor Changes
-
-- v3.25.21
+## [3.25.21] - 2025-08-21
+
+- Ensure subtask results are provided to GPT-5 in OpenAI Responses API
+- Promote the experimental AssistantMessageParser to the default parser
+- Update DeepSeek models context window to 128k (thanks @JuanPerezReal)
+- Enable grounding features for Vertex AI (thanks @anguslees)
+- Allow orchestrator to pass TODO lists to subtasks
+- Improved MDM handling
+- Handle nullish token values in ContextCondenseRow to prevent UI crash (thanks @s97712)
+- Improved context window error handling for OpenAI and other providers
+- Add "installed" filter to Roo Marketplace (thanks @semidark)
+- Improve filesystem access checks (thanks @elianiva)
+- Support for loading Roo modes from multiple YAML files in the `.roo/roo_modes` directory (thanks @farazoman)
+- Add Featherless provider (thanks @DarinVerheijke)
 
 ## [3.25.20] - 2025-08-19