feat(linalg): Add weighted and generalized least squares solvers#1096

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aamrindersingh:1047-weighted-lstsq

Commits on Jan 23, 2026

feat(linalg): add weighted and generalized least-squares solvers
aamrindersingh
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fix: resolve compilation errors in weighted/generalized lstsq
aamrindersingh
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Commits on Jan 24, 2026

fix(linalg): use column-major loops and harden input validation in weighted/generalized lstsq
aamrindersingh
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