feat: add Ising gates (RXX, RYY, RZZ) across full stack#3
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Add three two-qubit Ising rotation gates using the exp(-i*theta/2 * P⊗P) convention, consistent with existing single-qubit rotations and OpenQASM 3.0. - Gate constructors with correct unitary matrices - Builder convenience methods + symbolic (SymRXX/SymRYY/SymRZZ) variants - QASM parser (rxx/ryy/rzz) and emitter round-trip support - CX-basis decomposition rules (RZZ: 2 CX, RXX/RYY: 2 CX + conjugation) - Optimized statevector kernel for RZZ (full-diagonal, ~4x vs generic) - RXX/RYY fall through to generic 4x4 kernel - Unitarity, inverse, and identity-at-zero tests
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Add three two-qubit Ising rotation gates using the exp(-i*theta/2 * P⊗P) convention, consistent with existing single-qubit rotations and OpenQASM 3.0.