Baseline: full tree snapshot after git repository loss

The previous .git directory was found gutted (only info/ remained), so
history is unrecoverable locally. This commit restores version control
with the tree exactly as it stands: the working app, the preview-tracks
launcher on the artist hero, the scrollable-track-previews design bundle
(docs + approved mockups), and the Phase 0 validation artifacts.

crates/metadata/examples/album_info_probe.rs

@@ -0,0 +1,44 @@
+//! Live probe for identity-scoped release descriptions + type hints.
+//!
+//! Usage: cargo run -p metadata --example album_info_probe -- "Artist|Title" ...
+
+use metadata::MetadataClient;
+use std::sync::Arc;
+
+#[tokio::main]
+async fn main() {
+    let client = Arc::new(MetadataClient::new());
+    let requests: Vec<String> = std::env::args().skip(1).collect();
+    for request in requests {
+        let Some((artist, title)) = request.split_once('|') else {
+            eprintln!("expected Artist|Title, got {request}");
+            continue;
+        };
+        let search = client.catalog_search(artist).await;
+        let id = search
+            .artists
+            .iter()
+            .find(|a| normalize(&a.name) == normalize(artist))
+            .map(|a| a.id);
+        let info = client.album_info_for_artist_id(id, artist, title).await;
+        println!(
+            "{} | {} (id {:?})\n  source={:?} hint={:?}\n  desc={}\n",
+            artist,
+            title,
+            id,
+            info.source,
+            info.type_hint,
+            info.description
+                .as_deref()
+                .map(|d| d.chars().take(140).collect::<String>())
+                .unwrap_or_else(|| "<none>".into()),
+        );
+    }
+}
+
+fn normalize(s: &str) -> String {
+    s.to_lowercase()
+        .chars()
+        .filter(|c| c.is_alphanumeric())
+        .collect()
+}