Correct the A.4.33 versor identity test

[utiberious]

Closes #14.

Appendix A.4.33 of arXiv:1205.5935 states

(A B ~A) ∧ (A C ~A) = (A ⊛ A) A (B ∧ C) ~A.

For a versor A, ~A is reversion and A ⊛ A is the signed scalar product. The commented test used the Clifford conjugate Aǂ and the unsigned magnitude norm()^2, so it did not encode the paper's identity.

The new test uses small, concrete witnesses in Cl2 and ℂ, the one-generator negative-signature algebra. Their values of A ⊛ A are +1 and -1, respectively. Each case first checks that the left-hand side is nonzero, preventing a vacuous pass, and then checks the identity.

PR #19 records the original expression as @test_broken. This patch addresses the same gap by correcting the expression and adding passing, sign-sensitive coverage.

Mutation checks performed during verification:

• replacing ~A with Aǂ fails both witnesses
• doubling the right-hand side fails both witnesses
• replacing A ⊛ A with the unsigned norm fails the negative-signature witness

Verification with Julia 1.10.11 and Python galgebra==0.6.0:

• focused A.4.33 test: 4 passed
• full suite: 1,335 passed, 1 pre-existing A.4.35 broken, 1,336 total

No dependency or version changes are included.