Return short reads from ByteFlow.runToInputStream - #364
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Bulk read(byte[], off, len) blocked until the buffer was full or the stream ended, so consumers reading large buffers stalled on live sources. It now blocks only for the first byte and returns what is buffered. Closes #354
Rename the non-blocking helper, trim comments and javadoc, and restore the bulk-read assertions in handleEmptyChunksInStream so it fails on the old behaviour.
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Port of jox [#364](softwaremill/jox#364). The `InputStream` from `runToInputStream` filled the whole buffer on bulk reads, blocking for further chunks until the buffer was full or the stream ended. Consumers reading in large blocks (e.g. JSON parsers) stalled on live sources. Bulk reads now block only until at least one byte is available, copy what is buffered from the current chunk, and return the count. End of stream still returns -1. Two existing tests changed to expect one chunk per read. Merge order: this PR first, then #506, then #507. 🤖 Generated with [Claude Code](https://claude.com/claude-code) https://claude.ai/code/session_01QKfjf299iNreqRt32n2p5D
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The InputStream returned by ByteFlow.runToInputStream filled the whole buffer on bulk reads, blocking for further chunks until the buffer was full or the stream ended. Consumers that read in large blocks (e.g. Jackson, 8 KB) stalled on live sources.
Bulk reads now block only until at least one byte is available, copy what is already buffered from the current chunk, and return the count. End of stream still returns -1.
Closes #354