FLX-5032: histogram bins do not partition the declared range

Family: numerics (the 5000 band)

SEAM-FIDELITY-SPEC §2: bins are strictly increasing and partition the declared range. The first edge is the column's declared minimum and the last its declared maximum; otherwise a record could fall outside every bin and the two sides' bin counts would not account for the same records.

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$ fluxsim explain FLX-5032

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