chore: regenerate bindings and the traceability matrix

bindings.ts picks up the library-exclusion commands and types from tauri-specta.
The matrix regenerates because validation.ts and its test are gone — the doc
link checker caught the stale references, which is the first time that gate has
paid for itself on a generated artifact rather than a hand-written link.

Also drops exclusions::is_excluded: a wrapper over is_excluded_by that only a
test called, while the trait impls hoist the snapshot themselves. The test now
calls the same path production does.

src-tauri/src/commands/library.rs

@@ -279,7 +279,10 @@ mod tests {
         };
 
         let json = serde_json::to_string(&settings).expect("serialises");
-        assert!(json.contains("\"excludedItemIds\""), "camelCase on the wire");
+        assert!(
+            json.contains("\"excludedItemIds\""),
+            "camelCase on the wire"
+        );
 
         let parsed: LibrarySettings = serde_json::from_str(&json).expect("parses back");
         assert_eq!(parsed, settings);