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Implements CP-SAT constraint solver infrastructure for classification: - ConstraintModel: Wrapper around OR-Tools CP-SAT with helper methods - add_candidate(), at_most_one_of(), exactly_one_of() - if_selected_then(), if_any_selected_then_one_of() - mutually_exclusive(), add_block_exclusivity_constraints() - maximize(), solve() - SchemaConstraintGenerator: Auto-generates constraints from schemas - Uses EXPLICIT naming convention: field_name_candidate(s) - Generates structural constraints from Pydantic field types - Supports custom constraints via **constraint_rules** - Base class updates: - LabelClassifier.declare_constraints() hook for custom constraints - Classifier.**init**(use_constraint_solver=False) flag - ClassificationResult.is_solver_selected(), set_solver_selection() - Python version: Temporarily downgraded to 3.13 - ortools doesn't support Python 3.14 yet (as of Dec 2025) - Will upgrade back to 3.14 when ortools releases support - PR merged but not released: <google/or-tools#4922> Phase 0 complete: Infrastructure ready, no behavior changes yet. Next: Phase 1 - PartsList + Parts implementation.
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