This pull request introduces a new timeout control node to the flow control system and makes minor improvements for code consistency and correctness. The most significant change is the addition of the TimeoutNode, which allows execution branches to be managed based on completion within a specified time limit.

Control Node Enhancements

• Added a new timeout module with the TimeoutNode, enabling execution of a branch with a configurable timeout. The node provides separate outputs for completed and timed-out execution paths, improving flow control flexibility. (packages/catalog/src/control/timeout.rs)
• Registered the new TimeoutNode in the control node registry so it is available for use in flows. (packages/catalog/src/control.rs) [1] [2]

Minor Code Improvements

• Used the more idiomatic unwrap_or_else(String::new) instead of a closure for defaulting to an empty string, simplifying the code. (packages/catalog/src/ai/generative/agent/simple.rs)
• Removed unnecessary .into() conversion when assigning assistant message content, ensuring correct type usage. (packages/catalog/src/ai/generative/agent/simple.rs)
• Removed an unused import (CompletionModelDyn) from packages/core/src/bit.rs for code cleanliness.