Go stringified sheet cells with fmt.Sprint, so a numeric VS read with
UNFORMATTED_VALUE was rendered as 2.609767878e+09. Text columns of the
payments sheet now go through sheets.CellString, which never uses
exponent form; bank inference uses the same helper.
Both sync implementations now append VS as a text cell so Sheets keeps
it a string and leading zeros survive. Existing rows are not rewritten.
Python already read VS as a digit string; a regression test pins that.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
kacerrandClaude Opus 5.5
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