Add iod='auto': Gauss with BK-IOD fallback#331

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feat/iod-auto-fallback

Commits on May 15, 2026

Add pybind11 eigen/stl includes so Observation.rho_hat is usable from Python

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Add BK basis primitives for the universal BK fitter.

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Bind BK basis primitives to Python and add Layer 1 tests.

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Add universal-BK LM driver run_bk_native_fit.

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Add Layer 2 convergence tests for run_bk_native_fit.

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Add engine='bk_native' dispatch to orbitfit.do_fit.

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Add Layer 3 engine-sweep tests against diagnostic/scan dataset.

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Add tools/bk_engine_sweep.py: full engine-sweep harness.

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Commits on May 17, 2026