Co-authored-by: Codex <noreply@openai.com>
Apply the rustfmt import ordering expected by CI for the moved token data tests. Co-authored-by: Codex <noreply@openai.com>
Move the foundational provider and token modules into codex-auth while keeping codex-core as the facade. Also move the corresponding unit tests and record the 3-PR migration checkpoints. Co-authored-by: Codex <noreply@openai.com>