feat(cli): add --shard <index>/<total> to split the suite across runners#758
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…ers (#739) Run a deterministic round-robin subset of the test files so a large suite can be split across parallel CI machines; the union of all shards is the full suite with no overlap. Index is 1-based and validated (bad input exits non-zero). Sharding happens on the collected file list before execution, so it composes with --parallel and --random-order. Closes #739
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🤔 Background
Related #739
Large suites want to scale horizontally across CI runners.
--shardruns a deterministic slice of the test files so a matrix job can execute part of the suite, with the union of all shards covering everything exactly once.💡 Changes
--shard <index>/<total>: a round-robin partition of the collected test files, 1-based index, validated (bad input errors with a non-zero exit).--parallel(which parallelizes on one host); shard applies first, then the slice can be parallelized — the two compose, as does--random-order.