The working iterate now lives in double inside the workspace (WorkspaceLength
4n^2 + 17n); A, b and the API x stay float and x is converted in at the start
and out at the end. The gradient, the free-stationarity check and the KKT test
all run in the double domain, which removes the float noise floor that made the
free-stationarity re-solve spin to the cap on optimal points (cond >= ~20).
A fixed tolerance is no longer the only stopping rule: after a stationarity
miss or a release, a pass that lowers the double cost by no more than rounding
reports Converged.
The tolerance scale is the larger of the gradient at the origin and at the box
point nearest the origin, so it never depends on the warm start; b = 0 with a
far start is no longer judged converged by its own steepness.
Two clauses were equivalent or unobservable and are deleted: the d <= 0 pivot
test (implied by d <= tol * diag) and the dependent[] exclusion from the
free-stationarity check (the progress rule now terminates it).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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