[codex] Add max reasoning effort#573
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Summary
Adds
ReasoningEffort::Max, serializing to the OpenAI wire value"max"through the existing lowercase serde rule.This lets typed request builders represent the
maxreasoning effort now shown for GPT-5.6 models in the OpenAI model catalog. The enum is shared across Chat, Responses, Evals, and Graders, so the variant is available whereverReasoningEffortis reused.Validation
cargo test -p async-openai --features chat-completion-types --test ser_decargo check -p async-openai --features responses