fix: replace deprecated gpt-3.5-turbo-0613 with gpt-4o-mini

[sergiobayona]

Replace all instances of the deprecated model gpt-3.5-turbo-0613 with gpt-4o-mini in executable code across examples and library code.

Changes:

• Updated 13 example files with model references
• Updated documentation examples
• Updated llm_validators.py docstring

---

Important

Replaces deprecated gpt-3.5-turbo-0613 with gpt-4o-mini across code and documentation.

• Behavior:
  • Replaces gpt-3.5-turbo-0613 with gpt-4o-mini in 13 example files, including run.py, citation_fuzzy_match.py, and multi_prediction.py.
  • Updates model references in llm_validators.py docstring.
• Documentation:
  • Updates model references in documentation examples, including logfire.md and exact_citations.md.

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[ellipsis-dev]

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[ellipsis-dev]

Docstring default now says 'gpt-4o-mini', but the function signature still defaults to 'gpt-3.5-turbo'. Update the parameter default for consistency.