fix(deep_causality_tensor): Minor lints and code improvements.

Signed-off-by: Marvin Hansen <marvin.hansen@gmail.com>

Author: marvin-hansen

deep_causality_tensor/src/types/causal_tensor/ops/tensor_inverse/mod.rs

@@ -64,7 +64,7 @@ impl<T> CausalTensor<T> {
                 }
             }
 
-            if max_val.is_zero() {
+            if max_val < T::epsilon() {
                 return Err(CausalTensorError::SingularMatrix); // Corrected error type
             }