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## Summary - split the single PR-blocking Bazel Windows test leg into four Windows shard jobs - preserve the existing required Windows Bazel check name with a lightweight aggregate gate - keep Linux/macOS Bazel test jobs and the separate Windows clippy/release jobs unchanged ## Why The ordinary PR Windows Bazel test leg was one GitHub Actions job, so Bazel only had in-job parallelism. This gives that lane real job-level fanout across separate Windows hosts while keeping the target set disjoint via stable label hashing. ## Evidence - final pre-rebase green run: `25774733562` - Windows shard target counts: `61/212`, `48/212`, `52/212`, `51/212` - Windows test fanout completed in about 7m29s versus a recent monolithic median around 22m26s ## Notes - this is scoped to the Bazel Windows test leg only - each shard keeps the existing Windows cross-compile/RBE path and restores the former monolithic Windows test cache - shard jobs do not upload duplicate repository caches after test work, keeping cache cleanup off the PR-blocking shard path - no local validation run; relying on GitHub Actions for the workflow-shaped check Co-authored-by: Codex <noreply@openai.com>
