feat(openai): GPT-5 previous_response_id, phase, and verbosity support#385

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luosc:feat/gpt5.4-long-tool-stability

Commits on Mar 8, 2026

feat(openai): support previous_response_id and phase for Responses API
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feat(openai): add verbosity support for GPT-5 family models
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Commits on Mar 9, 2026

fix: stabilize assistant verbosity and scope OpenAI GPT-5 controls
luosc
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