[SYSTEMDS-3933] Generalize OOC matrix-vector binary to support streamed vector input #2386
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This patch removes the assumption that the vector operand in
MatrixVectorBinaryOOCInstruction fits in memory.
Both operands are now handled via OOC streams. The vector stream is
consumed once and cached block-wise, allowing correct execution when
the vector itself is large or stored out-of-core.
Operator semantics and aggregation behavior remain unchanged.
Tested with MatrixVectorBinaryMultiplicationTest under OOC execution.