Preserve original LAS/LAZ intensity field through raycloud pipeline#18
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Extends the passthrough buffer from 8 to 10 bytes per point, adding the original uint16 sensor intensity so it is restored verbatim on write. Alpha is now read from extra_bytes[12/16] rather than point->intensity, keeping it separate from the sensor intensity value. Also fixes a weak-return misclassification where a low-intensity real return could be truncated to intensity=0 and flagged as unbounded.
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Extends the passthrough buffer from 8 to 10 bytes per point, adding the original uint16 sensor intensity so it is restored verbatim on write. Alpha is now read from extra_bytes[12/16] rather than point->intensity, keeping it separate from the sensor intensity value. Also fixes a weak-return misclassification where a low-intensity real return could be truncated to intensity=0 and flagged as unbounded.