Add data-driven background param models: ABCD, SmoothABCD, ExtendedABCD, SmoothExtendedABCD#130

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davidwalter2 wants to merge 10 commits intoWMass:mainfrom

davidwalter2:260411_abcd

Commits on Apr 11, 2026

Rename 'poi model' to 'param model' and add POI/nuisance configurability

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Add ABCD background estimation param model

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Support multiple --paramModel via CompositeParamModel

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Add SmoothABCD param model with exponential polynomial parameterisation

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Add ExtendedABCD param model and ABCD CI tests

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Add SmoothExtendedABCD param model

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Fix saturated chi2 ndf to subtract all free param model parameters

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Rename nnui → npou (parameters of uninterest)

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Make nparams a @property (npoi + npou) on ParamModel base class

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Add IsoMT convenience wrappers for all four ABCD param models

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