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## Why Recent `main` CI had repeated Windows timeouts in the legacy sandbox process tests: - `codex-windows-sandbox session::tests::legacy_capture_powershell_emits_output` failed in runs [24909500958](https://github.com/openai/codex/actions/runs/24909500958), [24908076251](https://github.com/openai/codex/actions/runs/24908076251), [24906197645](https://github.com/openai/codex/actions/runs/24906197645), [24905411571](https://github.com/openai/codex/actions/runs/24905411571), [24903336028](https://github.com/openai/codex/actions/runs/24903336028), and [24898949647](https://github.com/openai/codex/actions/runs/24898949647). - `legacy_tty_powershell_emits_output_and_accepts_input` failed in the same set of runs. - `legacy_non_tty_cmd_emits_output` failed in runs [24909500958](https://github.com/openai/codex/actions/runs/24909500958), [24908076251](https://github.com/openai/codex/actions/runs/24908076251), [24906197645](https://github.com/openai/codex/actions/runs/24906197645), and [24903336028](https://github.com/openai/codex/actions/runs/24903336028). - `legacy_non_tty_powershell_emits_output` failed in runs [24908076251](https://github.com/openai/codex/actions/runs/24908076251), [24906197645](https://github.com/openai/codex/actions/runs/24906197645), and [24903336028](https://github.com/openai/codex/actions/runs/24903336028). These failures were 30s timeouts on Windows x64 and/or arm64 rather than assertion failures. ## Root Cause The active legacy Windows sandbox process tests all exercise host-level resources: sandbox setup, ACL/user state, private desktop process launch, stdio capture, and PowerShell/cmd child cleanup. Running several of these tests concurrently can leave them competing for the same Windows sandbox setup path and process/session resources, which makes command startup or output collection hang under CI load. ## What Changed - Added a shared in-process mutex for the active legacy Windows sandbox process tests. - Held that guard across each legacy cmd/PowerShell process test so those host-resource-heavy cases run one at a time. - Kept the skipped legacy cmd TTY tests unchanged. ## Why This Should Be Reliable The tests still use unique homes and run the real legacy sandbox process path, but they no longer overlap the fragile host-level setup and process/session lifecycle. Serializing just this small group removes the concurrency race without reducing the behavioral coverage of each test. ## Verification - `cargo test -p codex-windows-sandbox` - GitHub Windows CI is the primary validation signal for the affected tests; on this PR, Windows clippy, Windows release, and Windows local Bazel passed after the serialization fix.