refactor (v2): better arch

Co-authored-by: Copilot <copilot@github.com>

crates/adapters/fastembed/src/tests/lib.rs

@@ -0,0 +1,33 @@
+use crate::{FastEmbedConfig, FastEmbedGenerator};
+use domain::smart::ports::EmbeddingGenerator;
+use fastembed::EmbeddingModel;
+
+/// Downloads the model on first run (~90 MB). Run with:
+///   cargo test -p fastembed-adapter -- --ignored
+#[tokio::test]
+#[ignore]
+async fn generates_embedding_with_correct_dimension() {
+    let generator =
+        FastEmbedGenerator::new(FastEmbedConfig::with_model(EmbeddingModel::AllMiniLML6V2))
+            .expect("model init failed");
+
+    let embedding = generator.generate("hello world").await.unwrap();
+
+    // AllMiniLML6V2 produces 384-dimensional vectors.
+    assert_eq!(embedding.len(), 384);
+    // Sanity: values are in a reasonable range.
+    assert!(embedding.iter().all(|v| v.is_finite()));
+}
+
+#[tokio::test]
+#[ignore]
+async fn different_texts_produce_different_embeddings() {
+    let generator =
+        FastEmbedGenerator::new(FastEmbedConfig::with_model(EmbeddingModel::AllMiniLML6V2))
+            .expect("model init failed");
+
+    let a = generator.generate("cats").await.unwrap();
+    let b = generator.generate("quantum mechanics").await.unwrap();
+
+    assert_ne!(a, b);
+}