Batch executor with bounded concurrency#25
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Add runBatch: pulls items from the streaming input iterator and runs them
through a worker with a fixed-size concurrency pool. Per-item failures are
captured as {class, message} error records and never abort the batch;
results are emitted via onResult in completion order, and a
{total, succeeded, failed} summary is returned.
Iterator pulls and result emissions are each serialised so async iterators
are not re-entered and onResult is never called concurrently.
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Part 2 of 4 for the batch-input feature. Builds on
batch-input-parsing.Adds
runBatch: pulls items from the streaming input iterator (part 1) and runs them through a worker with a fixed-size concurrency pool.{ class, message }error records and do not abort the batch.onResultin completion order; returns a{ total, succeeded, failed }summary.onResultis never called concurrently.Stack: 1/4 batch-input-parsing → 2/4 (this) → 3/4 batch-output → 4/4 wire-batch-flags