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Fix postponer ring buffer index underflow on prepend. - #1637
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prependEvent() decremented bufferPosition without wrapping, so activateKeyPostponed prepend could leave it at 254/255 and the next buffer[bufferPosition] access read out of bounds, causing hard faults or a stuck postponer. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Changelog:
activateKeyPostponed prependcommand.Closes #1326