fix(llm): isolate caller file messages

[ump45nose]

Summary

Copy caller-supplied message dictionaries before LiteLLM file formatting can replace content or remove the files field.

Root cause

The LiteLLM sync and async paths passed the caller's message dictionaries directly to their file-processing helpers, which mutate those dictionaries. Reusing the same message list therefore dropped attachments after the first call.

Validation

• uv run --with litellm --with anthropic pytest lib/crewai/tests/test_llm.py -k "does_not_mutate_file_messages" -q
• uv run ruff format --check lib/crewai/src/crewai/llm.py lib/crewai/tests/test_llm.py
• uv run ruff check lib/crewai/src/crewai/llm.py lib/crewai/tests/test_llm.py

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 1233bf09-a678-4fd2-a43e-b8e6dc1a678f

📥 Commits

Reviewing files that changed from the base of the PR and between 28d868c and 3bbcd8d.

📒 Files selected for processing (2)

• lib/crewai/src/crewai/llm.py
• lib/crewai/tests/test_llm.py

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📝 Walkthrough

Walkthrough

Changes

LLM message copy handling

Layer / File(s)	Summary
Copy messages before processing lib/crewai/src/crewai/llm.py	Synchronous and asynchronous call preparation shallow-copies list-based messages before file processing. String inputs keep their existing conversion behavior.
Validate message preservation lib/crewai/tests/test_llm.py	Regression tests verify multimodal file conversion without mutation of the caller’s messages in synchronous and asynchronous calls.

Suggested reviewers: lucasgomide

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: isolating caller-supplied file messages in LLM handling.
Description check	✅ Passed	The description explains the mutation bug, the synchronous and asynchronous fix, and the validation performed.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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