Release Notes:

- Fixed: DashScope (Aliyun) tool calls now preserve id and name across
streaming delta chunks
   

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    Aliyun (DashScope) SSE streaming sends id="" and name="" in
    subsequent tool_calls delta chunks after the first chunk. Previously
    these empty strings would unconditionally overwrite the accumulated
    id and name values, causing tool calls to lose identity and fail.
    
    Add is_empty() guards so id and name are only updated when the
    delta provides a non-empty value (falsy guard pattern), matching how
    Hermes Agent and OpenAI SDK handle this provider edge case.
    
    Test stream_maps_preserves_tool_id_and_name_across_empty_deltas
    simulates DashScope's actual streaming behavior and asserts that
    the completed ToolUse retains the correct id, name, and arguments.
    
    Files changed: 1 (+148/-2)
    - crates/open_ai/src/completion.rs
    
    CLA signed.
    
- [x] I've reviewed my own diff for quality, security, and reliability
    - [x] Tests cover the new/changed behavior
    - [x] Performance impact has been considered and is acceptable
    
 
<img width="980" height="1392" alt="CleanShot 2026-04-26 at 00 03 20@2x"
src="https://github.com/user-attachments/assets/428a845b-82a0-44eb-9e43-1a351de6ca6a"
/>

After FIx
<img width="900" height="1398" alt="CleanShot 2026-04-26 at 00 02 15@2x"
src="https://github.com/user-attachments/assets/604e36fd-bf90-4549-9e60-8a927033d3e9"
/>

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Co-authored-by: Bennet Bo Fenner <bennetbo@gmx.de>