refactor: eradicate deprecated tools (sticky_notes, pinned_files, context_workspaces, pr_checklist, preferences) and dead code

server/src/embedding.rs

@@ -280,12 +280,16 @@ pub fn cosine_similarity(a: &[f32], b: &[f32]) -> f32 {
         norm_b_sq += y * y;
     }
 
-    let norm_a = norm_a_sq.sqrt();
-    let norm_b = norm_b_sq.sqrt();
-    if norm_a == 0.0 || norm_b == 0.0 {
+    // Fast path: If vectors are already normalized (Candle & fallback embeddings), skip square roots
+    if (norm_a_sq - 1.0).abs() < 1e-4 && (norm_b_sq - 1.0).abs() < 1e-4 {
+        return dot_product.clamp(-1.0, 1.0);
+    }
+
+    let norm_product = norm_a_sq * norm_b_sq;
+    if norm_product <= 0.0 {
         0.0
     } else {
-        dot_product / (norm_a * norm_b)
+        (dot_product / norm_product.sqrt()).clamp(-1.0, 1.0)
     }
 }