pyspec: SpecExpr arithmetic/comparison/boolean vocabulary#1426
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…wering Adds the SpecExpr constructors (arithmetic/comparison/boolean/unary/is-membership values incl. pow and neg) with full DDM serialization round-trip and Laurel lowering to the runtime prelude ops (PEq/PNEq/PLt..PGe, PAdd..PPow, PNeg), matching the body translator. No producers yet.
…or/not, unary -, is/in) to the SpecExpr vocabulary transExpr/transCompare producers via a binArith helper; routes == to the normalized PEq term and is/is-not-None and in/not-in through the prelude P-ops, so a contract and a caller agree. Drops the now-obsolete 'unsupported comparison' warning expectation.
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Lets contracts use the operators a Python body can, each lowering to the same runtime prelude term the body emits (so a contract and a caller agree):