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## Why `rust-ci-full` was paying the full Cargo nextest build-and-run cost once per platform, with Windows ARM64 as the long pole. This change moves the heavy work into one reusable per-platform flow: build a nextest archive once, then replay it across four shards so the platform lane spends less time running tests serially. For Windows ARM64, the archive is cross-compiled on Windows x64 and replayed on native Windows ARM64 shards so the slow ARM64 machine is used for execution rather than compilation. ## What changed - split the `rust-ci-full` nextest matrix into five explicit per-platform reusable-workflow calls - add `.github/workflows/rust-ci-full-nextest-platform.yml` to build one archive, upload timings/helpers, replay four nextest shards, upload per-shard JUnit, and roll the shard status back up per platform - add Windows CI helpers for Dev Drive setup and MSVC ARM64 linker environment export so the Windows ARM64 archive can be produced on Windows x64 - keep the existing Cargo git CLI fetch hardening inside the reusable workflow, since caller workflow-level `env` does not flow through `workflow_call` - document the archive-backed shard shape in `.github/workflows/README.md` - raise the default nextest slow timeout to 30s so the sharded full-CI path does not treat every >15s test as stuck ## Verification - validated the archive/shard flow with live GitHub Actions runs on this PR branch - Windows ARM64 cross-compile latency on completed runs: - https://github.com/openai/codex/actions/runs/26118759651: `34m30s` lane e2e, `17m16s` archive build, `9m55s` shard phase - https://github.com/openai/codex/actions/runs/26120777976: `30m36s` lane e2e, `17m21s` archive build, `6m50s` shard phase - comparable pre-cross-compile sharded Windows ARM64 runs were `55m01s`, `50m21s`, and `46m42s`, so the completed cross-compile runs improved the lane by roughly `12m` to `24m` versus the prior range - latest corrected cross-compile run: https://github.com/openai/codex/actions/runs/26120777976 - Windows ARM64 archive built successfully on Windows x64 - native Windows ARM64 shards started immediately after the archive upload - 3/4 Windows ARM64 shards passed; the failing shard hit the same existing `code_mode` test failure seen outside this lane - downloaded failed-shard JUnit XML from the validation runs and confirmed the remaining red is from known test failures, not archive/shard wiring - no local Codex tests run per repo guidance ## Notes - this PR does not change developers.openai.com documentation
