clip-search: fmt + clippy clamp + test AppState arg

Pulls cargo fmt + clippy pass over the new files only — pre-existing
files left untouched even though fmt has drift on them. clamp(1,200)
swaps a manual min/max chain that clippy flagged. test AppState
constructor needed ClipClient::new(None) so the lib-test target
compiles.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/bin/probe_clip_search.rs

@@ -122,7 +122,10 @@ async fn main() -> anyhow::Result<()> {
         .into_iter()
         .find(|l| l.id == args.library)
         .ok_or_else(|| anyhow::anyhow!("library id {} not found", args.library))?;
-    info!("probing library #{} ({}) at {}", lib.id, lib.name, lib.root_path);
+    info!(
+        "probing library #{} ({}) at {}",
+        lib.id, lib.name, lib.root_path
+    );
 
     let dao: Arc<Mutex<Box<dyn ExifDao>>> = Arc::new(Mutex::new(Box::new(SqliteExifDao::new())));
     let ctx = opentelemetry::Context::new();
@@ -136,9 +139,7 @@ async fn main() -> anyhow::Result<()> {
     let query_vec = decode_f32_vec(&query_resp.embedding)?;
     info!(
         "query encoded ({}d, {}ms): {:?}",
-        query_resp.embedding_dim,
-        query_resp.duration_ms,
-        args.query
+        query_resp.embedding_dim, query_resp.duration_ms, args.query
     );
 
     // Page through (id, rel_path), filter to images on disk, encode up
@@ -245,7 +246,11 @@ async fn main() -> anyhow::Result<()> {
     scores.sort_by(|a, b| b.0.partial_cmp(&a.0).unwrap_or(std::cmp::Ordering::Equal));
     let elapsed = started.elapsed();
     println!();
-    println!("── top {} for query: {:?} ──", args.top.min(scores.len()), args.query);
+    println!(
+        "── top {} for query: {:?} ──",
+        args.top.min(scores.len()),
+        args.query
+    );
     for (i, (sim, path)) in scores.iter().take(args.top).enumerate() {
         println!("[{:>2}] sim={:.3}  {}", i + 1, sim, path);
     }