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These operators are needed to parse and evaluate GEMS model expressions from antares_legacy_models.yml, which uses ceil(p/q), max(0, expr), and min(a, b) in variable bounds and constraint expressions for thermal unit commitment models. Changes: - Add FloorNode, CeilNode (unary) and MaxNode, MinNode (binary) AST nodes - Add floor()/ceil() methods on ExpressionNode; maximum()/minimum() factory fns - Extend Expr.g4 grammar with binaryFunction rule; regenerate ANTLR files - Update all visitors: abstract ExpressionVisitor, CopyVisitor, PrinterVisitor, EvaluationVisitor, ExpressionDegreeVisitor, TimeScenarioIndexingVisitor, EqualityVisitor - Register floor/ceil in _FUNCTIONS and max/min in new _BINARY_FUNCTIONS dict - Add tests for parsing, evaluation, and printing of the new operators https://claude.ai/code/session_01VUYEHTGsxtBYVEVm5c7ysC
…ExpressionBuilder Add ceil, floor, maximum, minimum implementations to all ExpressionVisitor subclasses that were missing them after the new math operators were added. https://claude.ai/code/session_01VUYEHTGsxtBYVEVm5c7ysC
floor(x), ceil(x), max(x,y), min(x,y) are not polynomials when their operands involve variables, so their degree is mathematically undefined (infinity) rather than equal to the operand degree. Also widens ExpressionDegreeVisitor and compute_degree from int to int | float to accommodate math.inf. https://claude.ai/code/session_01VUYEHTGsxtBYVEVm5c7ysC
…| float When ExpressionDegreeVisitor is parameterized as ExpressionVisitor[int | float], visit() returns int | float everywhere, so all methods that call visit() and were annotated -> int now need -> int | float. https://claude.ai/code/session_01VUYEHTGsxtBYVEVm5c7ysC
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