Refactor Sem mult-group support#317

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alyst wants to merge 10 commits intoStructuralEquationModels:develfrom

alyst:refactor_sem_terms

Commits on Mar 11, 2026

Project.toml: support Symbolics v7 & Utils v4
Alexey Stukalov
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prepare_start_params(): tighten type check
Alexey Stukalov
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SemImplied/SemLossFun: drop meanstructure kwarg

alyst
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Alexey Stukalov
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refactor Sem, SemEnsemble, SemLoss

alyst
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Alexey Stukalov
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params/param_labels(): use both as synonyms for now
Alexey Stukalov
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check_same_semterm_type(): refactor check_single_lossfun()
Alexey Stukalov
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update multi-group correction
Alexey Stukalov
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replace_observed(): simplify & refactor
Alexey Stukalov
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bootstrap: sync with Sem updates
Alexey Stukalov
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docs: sync with Sem refactor
Alexey Stukalov
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