bench: independent memory-ladder re-measurement + sweep_mode at-scale caveat#1
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… caveat Fresh CPX51 run: LU/LDLT ladder 626k-2.8M DOFs (ratio 0.58-0.60, cert numbers reproduced within 2.5%), rank sweep 1-16 (memory vs ranks quantified on both metrics), coax-vs-sphere per-DOF constant (2.8x), Nf=22 workload shape, and a measured negative: sweep_mode loses to per-frequency LDLT refactorization at 2.26M DOFs. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Fresh CPX51 re-measurement answering the reviewer questions on memory scaling: LU/LDLT ladder 626k–2.8M DOFs (LDLT 0.58–0.60×, certification numbers reproduced within 2.5%), rank-count sweep, coax-vs-sphere per-DOF constant (2.8×), Nf=22 workload shape, and a measured sweep_mode negative at scale. Adds bench/memladder.sh + results doc, one caveat paragraph in docs/SOLVER_IMPROVEMENTS.md.
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