developer_analysis 1.1: integer attributes get integer statistics

An integer attribute's min, max, sum and spread, and its per-point
change and previous value, were written as floats. They are now
integers, accumulated as integers so a sum past float precision stays
exact; average and ratio stay floats, since an average of integers is
not one. Float attributes are untouched.

No node reads these keys yet, and VEX reads an integer dictionary value
into a float unchanged (only a float read as an int is zeroed), so a
float reader keeps working; verified with a downstream wrangle reading
the integer min, spread and change as floats.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

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