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## Why Recent `rust-ci-full` failures were dominated by transient Windows timeout clusters in process-heavy tests such as `suite::resume`, `suite::cli_stream`, `suite::auth_env`, `start_thread_uses_all_default_environments_from_codex_home`, and `connect_stdio_command_initializes_json_rpc_client_on_windows`. The goal here is to make those known flaky paths less likely to fail full CI without relaxing the global nextest timeout policy. ## What changed - Enable one global nextest retry with `retries = 1` so a single transient failure can recover. - Add a `windows_process_heavy` test group with `max-threads = 2` for the recurring Windows subprocess/session-heavy timeout families. - Add Windows-only slow-timeout overrides for that process-heavy group. - Add a narrower Windows-only timeout override for `start_thread_uses_all_default_environments_from_codex_home`, which still exceeded the broader Windows bucket in both Windows full-CI lanes. - Increase the `rust-ci-full` nextest job timeout from `45m` to `60m` so Windows ARM64 still has job-level headroom after retries and targeted per-test timeout increases. - Keep the global `slow-timeout` unchanged at `15s`. ## Validation Validated through `rust-ci-full` GitHub Actions reruns on this PR. Observed improvement on the tuned Windows lanes: - Windows x64 went from `5 timed out` to `0 timed out`. - Windows ARM64 went from `2 timed out` to `0 timed out`. - `start_thread_uses_all_default_environments_from_codex_home` recovered as a flaky pass on Windows ARM64 instead of timing out. The remaining failing tests in those runs were unrelated hard failures outside this nextest timeout tuning.
