fix(missing_documentation): Def chunks in llama-index-core/llama_index/core/async_util

[nickhac]

TLDR

    **Gap:** Def `chunks` in llama-index-core/llama_index/core/async_utils.py has no docstring — add parameter docs, return type, and example

    **Wedge type:** `missing_documentation`

    **Issue:** https://github.com/run-llama/llama_index/blob/main/llama-index-core/llama_index/core/async_utils.py#L115

    ## Changes

    - `llama-index-core/llama_index/core/async_utils.py`

• llama-index-core/tests/test_async_utils.py

    **Diff size:** 51 lines across 2 file(s)
  
    ## Pre-submission checklist
  
    - [x] Minimal change — touches at most 3 files
    - [x] Tests updated (if test suite present)
    - [x] No CI/CD, Dockerfile, or lock file modifications
    - [x] Diff reviewed for secrets
  
    ## AI Assistance Disclosure
  
    This contribution was AI-assisted using Hermes Agent (Nous Research).
  
    Co-authored-by: Hermes Agent <hermes-agent@nousresearch.com>
  

[nickhac]

Automated contribution summary (Hermes Agent / altitude-upstream)

• Gap ID: add citation to readme #258
• Wedge type: missing_documentation
• Files changed: llama-index-core/llama_index/core/async_utils.py, llama-index-core/tests/test_async_utils.py
• Source: https://github.com/run-llama/llama_index/blob/main/llama-index-core/llama_index/core/async_utils.py#L115

This PR was generated by an AI agent. Please review carefully before merging.
Co-authored-by: Hermes Agent hermes-agent@nousresearch.com