Varying slopes: single slope on one factor (V=1) — centering + back-transform (#59)#79
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…l reparametrization (#59) A sole f[z] / f[[z]] term now solves: the slope column is centered against the pinned intercept (skipped when absent) and weighted-normalized per level, the solve runs in the whitened basis, and coefficients are mapped back to the user's parametrization. Rank drops are detected structurally over positive-weight rows and reported through the unidentified-directions side-channel with an exact minimal-norm 0 in the coefficient slot. Slopes alongside other terms (#61) and V>=2 per factor (#60) stay gated.
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Implements #59.
A design whose sole term carries one slope column (
f[z]/f[[z]]) now solves:0in the coefficient slotbuild_diagonalnow fills slope-column diagonal entries (was intercept-only)Tested against per-level closed forms (Rust) and pyfixest computed at test time (Python).