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## Why https://github.com/openai/codex/pull/16287 introduced a change to `codex-rs/login/src/auth/auth_tests.rs` that uses a PowerShell helper to read the next token from `tokens.txt` and rewrite the remainder back to disk. On Windows, `Get-Content` can return a scalar when the file has only one remaining line, so `$lines[0]` reads the first character instead of the full token. That breaks the external bearer refresh test once the token list is nearly exhausted. https://github.com/openai/codex/pull/16288 introduced similar changes to `codex-rs/core/src/models_manager/manager_tests.rs` and `codex-rs/core/tests/suite/client.rs`. These went unnoticed because the failures showed up when the test was run via Cargo on Windows, but not in our Bazel harness. Figuring out that Cargo-vs-Bazel delta will happen in a follow-up PR. ## Verification On my Windows machine, I verified `cargo test` passes when run in `codex-rs/login` and `codex-rs/core`. Once this PR is merged, I will keep an eye on https://github.com/openai/codex/actions/workflows/rust-ci-full.yml to verify it goes green. ## What changed - Wrap `Get-Content -Path tokens.txt` in `@(...)` so the script always gets array semantics before counting, indexing, and rewriting the remaining lines.