cm45t3r / candlestick / 27317671724

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fix(streaming): throw on empty patternFns to prevent infinite loop

Math.max(...[]) returns -Infinity, making the while condition always
true and the overlap slice index Infinity — so the buffer empties but
the loop never exits. Guard added at stream creation time with a clear
error message.

Fixes #74

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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