feat(deep_causality_sparse): Fixed feature flag pass through for Bazel config.

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

Author: marvin-hansen

deep_causality_num/src/algebra/monoid.rs

@@ -3,8 +3,7 @@
  * Copyright (c) "2025" . The DeepCausality Authors and Contributors. All Rights Reserved.
  */
 use crate::{Associative, MulMagma, One, Zero};
-use core::ops::{Add, AddAssign};
-use std::ops::{Div, DivAssign};
+use core::ops::{Add, AddAssign, Div, DivAssign};
 
 /// Represents an **Additive Monoid**.
 ///

deep_causality_sparse/BUILD.bazel

@@ -5,6 +5,9 @@ rust_library(
     srcs = glob([
         "src/**",
     ]),
+    crate_features = [
+        "std",
+    ],
     crate_root = "src/lib.rs",
     tags = [
         "uncertain",