fix: prevent Groq message mutation in structured output fallback (#562)#591

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Serhan-Asad wants to merge 3 commits intopromptdriven:mainfrom

Serhan-Asad:fix/issue-562

Commits on Feb 24, 2026

test: add failing tests for Groq message mutation bug (#562)
Serhan-Asad
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fix: deep copy formatted_messages to prevent Groq structured output mutation corrupting fallback models (#562)

Serhan-Asad
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claude
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test: trim Groq mutation tests to 3 focused regressions in test_llm_invoke.py (#562)

Serhan-Asad
and
claude
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