chore: gate test helpers, code style, stricter clippy

crates/adapters/rss/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "rss"
 version = "0.1.0"
-edition = "2024"
+edition.workspace = true
 
 [dependencies]
 rss-feed = { package = "rss", version = "2", features = ["atom"] }

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

@@ -60,7 +60,9 @@ fn channel_links_are_absolute_with_atom_self() {
 fn item_links_to_absolute_movie_page() {
     let adapter = RssAdapter::new("http://example.com".into());
     let e = entry(false);
-    let xml = adapter.render_feed(&[e.clone()], &channel("Feed")).unwrap();
+    let xml = adapter
+        .render_feed(std::slice::from_ref(&e), &channel("Feed"))
+        .unwrap();
     let expected = format!(
         "<link>http://example.com/movies/{}</link>",
         e.movie().id().value()