Fix review comments: remove unused mu_o variable

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Co-authored-by: FlorianPfaff <6773539+FlorianPfaff@users.noreply.github.com>

Author: Copilot

pyrecest/distributions/hypertorus/toroidal_vm_matrix_distribution.py

@@ -278,7 +278,6 @@ def marginalize_to_1d(self, dimension):
         other = 1 - dimension
 
         mu_d = float(self.mu[dimension])
-        mu_o = float(self.mu[other])  # noqa: F841 – retained for clarity
         k_d = float(self.kappa[dimension])
         k_o = float(self.kappa[other])
         a11 = float(self.A[0, 0])