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The Codex `_astream` path was reworked to build its auth headers from an async-fetched token, but `_agenerate` was left on the old "prime the cache, then read it back synchronously" approach. That sync read still went through `_FileChatGPTOAuthTokenProvider.get_token`, which acquires a thread lock and a cross-process file lock on every call — blocking the event loop even when the token is already warm. Both async paths now build headers the same way, so neither touches sync `get_token` on the loop. ## Changes - `_ChatOpenAICodex._agenerate` now fetches the token via `aget_token`, builds the Codex headers off-loop, and hands them to `_get_request_payload` through the private `_codex_headers` kwarg — eliminating the synchronous token read (and its lock acquisition) that previously ran on the event loop inside `super()._agenerate`. - Replaced the duplicated `"_codex_headers"` string literal across `_agenerate`, `_astream`, and `_get_request_payload` with a `_CODEX_HEADERS_KWARG` module constant, documenting that the kwarg is popped before the payload reaches the SDK. - Documented the deliberate `is not None` check in `_get_request_payload`: an explicitly-built empty header dict (accountless token with `originator=None`) is honored as-is rather than falling back to the blocking sync read.