Varying slopes: solve-result side-channel for unidentified directions (#69)#77
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…nnel (#69) UnidentifiedDirection (term, level, column) entries on SolveResult and BatchSolveResult (shared across RHS), mirrored on the Python result classes. Always empty until Solver::new accepts slope terms; dropped slots hold minimal-norm 0, never NaN.
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Implements the contract for #69 (contract only — nothing detects rank drops until #59 relaxes the slope guard).
UnidentifiedDirection { term, level, column }entries onSolveResultandBatchSolveResult; the batch list is shared across RHS (identification depends only on design + weights).x: dropped slots hold minimal-norm0, never NaN.unidentifiedon both result classes as(term, level, column)tuples, with stubs.0+ one entry) lands as Varying slopes: single slope on one factor (V=1) — centering + back-transform #59's first test.Note: merging into
feature/slopeswon't auto-close #69 — close it manually after merge.