Squashed 'vendor/ruvector/' content from commit b64c2172

git-subtree-dir: vendor/ruvector
git-subtree-split: b64c21726f2bb37286d9ee36a7869fef60cc6900

crates/ruvector-solver/build.rs

@@ -0,0 +1,14 @@
+fn main() {
+    // Emit cfg flags for SIMD detection at build time
+    println!("cargo:rerun-if-changed=build.rs");
+
+    #[cfg(target_arch = "x86_64")]
+    {
+        if std::env::var("CARGO_CFG_TARGET_FEATURE").map_or(false, |f| f.contains("avx2")) {
+            println!("cargo:rustc-cfg=has_avx2");
+        }
+        if std::env::var("CARGO_CFG_TARGET_FEATURE").map_or(false, |f| f.contains("avx512f")) {
+            println!("cargo:rustc-cfg=has_avx512");
+        }
+    }
+}