GaussianOps

Symplectic operations preserve physicality and the covariance algebra

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Test	What it does	Result
test_bs_identity	A beamsplitter with t = 1.0 is the identity on covariance and mean.	✅ pass
test_bs_splits	A t = 0.5 beamsplitter on coherent + vacuum sends sqrt(t) each way and keeps vacuum covariance.	✅ pass
test_displace_mean_only	Displacement moves the mean by (x, p) and never touches the covariance.	✅ pass
test_rotate_swaps	Rotating a squeezed state by pi/2 exchanges var_x and var_p.	✅ pass
test_squeeze_inverse	Squeezing by r then by -r returns the original vacuum covariance.	✅ pass