* fix: validate parallel tool calls with tool rules at create/update time Move validation from runtime to agent create/update time for better UX. Add client-side enforcement to truncate parallel tool calls when disabled (handles providers like Gemini that ignore the setting). 🤖 Generated with [Letta Code](https://letta.com) Co-Authored-By: Letta <noreply@letta.com> * update apis * undo --------- Co-authored-by: Letta <noreply@letta.com>