A different bounded solver for the unresolved stretches

The first recovery trial recovered eight unfinished primary fits but did not finish any of its three unresolved stretches. The saved-result audit separates excessive remaining gradients from failed measurement-stability checks.

This trial changed how the optimizer chooses its bounded steps. The measurements, Earth models, calibration bounds and uncertainty assumptions stay the same. It also requires a fresh stability check and saves enough local numerical information to diagnose another stall without repeating a complete fit.

The small software screen found a known-answer problem that reproduces one of the earlier stopping failures. The alternative method passed that problem and all 30 screen controls. The completed archival trial passed 8/24 fits: all six completed controls, two unfinished primary fits and no perturbed repeats. It used 2,021 native sweeps. None of the three test stretches became fully resolved; qualification failed. Results and the saved-tangent diagnosis preserve the outcomes and explain the numerical stalls. Do not resume this study.

The completed freeze is data/ilvis0-rectangular-recovery-trial-v2-20261012/, which freezes the complete numerical-helper dependencies. The zero-start earlier preparation is preserved and must not be launched.

The finite plan uses the same three failure examples and completed control: 24 starts, at most 14,448 native sweeps, two total numerical threads and no retries. Estimated runtime at the ceiling is 10–14 hours. All planned fits, control comparisons and repeats must pass before expanding. The original 12 globe preferences, zero flat preferences, 41 unresolved remains unchanged.

Preparation and launch

From the repository root, build the software receipt, then prepare the freeze:

env PYTHONPATH=analysis OPENBLAS_NUM_THREADS=2 OMP_NUM_THREADS=2 MKL_NUM_THREADS=2 ~/venv/bin/python docs/ilvis0-rectangular-recovery-trial-20261012/build_controls.py
env PYTHONPATH=analysis OPENBLAS_NUM_THREADS=2 OMP_NUM_THREADS=2 MKL_NUM_THREADS=2 ~/venv/bin/python analysis/tests/ilvis0_rectangular_worker.py --prepare-only

Only after approving this finite allowance, record authorization and launch as separate commands:

env PYTHONPATH=analysis OPENBLAS_NUM_THREADS=2 OMP_NUM_THREADS=2 MKL_NUM_THREADS=2 ~/venv/bin/python analysis/tests/ilvis0_rectangular_worker.py --record-authorization
env PYTHONPATH=analysis OPENBLAS_NUM_THREADS=2 OMP_NUM_THREADS=2 MKL_NUM_THREADS=2 ~/venv/bin/python analysis/tests/ilvis0_rectangular_worker.py --detach

The worker preserves shared locks, source/input/environment checks, charged journals and atomic results. It publishes automatically on completion. --package-only publishes completed outputs without refitting. Do not resume a completed trial or spend its unused allowance elsewhere.