getPackedAttrAt
Returns the primary packed cell attribute word at [col, row].
Out-of-bounds column probes return the active primary pen word. This mirrors the terminal's current erase/write attribute for off-grid queries. Decode this value together with getPackedExtendedAttrAt via io.github.ketraterm.core.codec.AttributeCodec.
Return
Primary packed attribute word for the cell or active pen.
Parameters
col
Column index (0-based).
row
Row index (0-based).