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NeilandOrca
0944fdbef9
iterateTerminalOutputFrameChunks walked `for (const part of data)`, materializing a 1-2 character string per code point and calling terminalStreamByteLength on each, while accumulating the frame text with `chunk += part`. The accumulator was never needed: `chunk` only ever reconstructs the contiguous substring data[chunkStart..end), and `startSeq + chunkStartOffset + chunk.length` collapses algebraically to `startSeq + end`. Track two integer offsets and emit data.slice(chunkStart, end) instead, computing UTF-8 width inline from charCodeAt. Also short-circuits the cap gate on UTF-16 length before measuring UTF-8 bytes, which is sound because UTF-8 length is never below UTF-16 length. 2.4-6.1x across payload shapes, stable across reruns. This runs per terminal output batch and per snapshot chunk. Extracted to its own module along a real seam (the chunk-emission concern plus its two types and cap gate); methods/terminal.ts shrinks by 85 lines. No max-lines suppression added and the baseline is untouched. Co-authored-by: Orca <help@stably.ai>