/**
 * Shard runner — the parallel-spawn path (`runShardsInParallel`).
 *
 * Drives real child processes via a tiny fixture "CLI" script that
 * stands in for `graph-shard-worker`: it reads the spec temp file the
 * runner writes, and emits either a valid `ShardBuildResult` JSON on
 * stdout (success) or a non-zero exit with stderr (failure), keyed by
 * the shard id. This exercises spec-file write, spawn, stdout capture,
 * JSON parse, success/failure partitioning, and deterministic ordering
 * without standing up a TypeScript build.
 */
export {};
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