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## Summary This PR moves Codex backend request authentication from direct bearer-token handling to `AuthProvider`. The new `codex-auth-provider` crate defines the shared request-auth trait. `CodexAuth::provider()` returns a provider that can apply all headers needed for the selected auth mode. This lets ChatGPT token auth and AgentIdentity auth share the same callsite path: - ChatGPT token auth applies bearer auth plus account/FedRAMP headers where needed. - AgentIdentity auth applies AgentAssertion plus account/FedRAMP headers where needed. Reference old stack: https://github.com/openai/codex/pull/17387/changes ## Callsite Migration | Area | Change | | --- | --- | | backend-client | accepts an `AuthProvider` instead of a raw token/header | | chatgpt client/connectors | applies auth through `CodexAuth::provider()` | | cloud tasks | keeps Codex-backend gating, applies auth through provider | | cloud requirements | uses Codex-backend auth checks and provider headers | | app-server remote control | applies provider headers for backend calls | | MCP Apps/connectors | gates on `uses_codex_backend()` and keys caches from generic account getters | | model refresh | treats AgentIdentity as Codex-backend auth | | OpenAI file upload path | rejects non-Codex-backend auth before applying headers | | core client setup | keeps model-provider auth flow and allows AgentIdentity through provider-backed OpenAI auth | ## Stack 1. https://github.com/openai/codex/pull/18757: full revert 2. https://github.com/openai/codex/pull/18871: isolated Agent Identity crate 3. https://github.com/openai/codex/pull/18785: explicit AgentIdentity auth mode and startup task allocation 4. This PR: migrate Codex backend auth callsites through AuthProvider 5. https://github.com/openai/codex/pull/18904: accept AgentIdentity JWTs and load `CODEX_AGENT_IDENTITY` ## Testing Tests: targeted Rust checks, cargo-shear, Bazel lock check, and CI.