Pauli

PauliString parsing and algebra

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Test	What it does	Result
test_commutation	X and Z anticommute; XX and ZZ commute.	✅ pass
test_from_sparse	from_sparse places single-qubit Paulis.	✅ pass
test_identity	identity(n) is +I...I.	✅ pass
test_mul_signs	(-X)*(Y) carries the - through: = -iZ.	✅ pass
test_mul_xy_is_iz	X * Y = +iZ.	✅ pass
test_mul_yx_is_minus_iz	Y * X = -iZ.	✅ pass
test_mul_zz_is_identity	Z * Z = +I.	✅ pass
test_parse_repr_roundtrip	Parsing then repr is the identity for signed Paulis.	✅ pass