chore(fmt): apply cargo fmt to recent LSP changes

Pure rustfmt churn — the anchor-match, source-relative resolution,
and config-unwrap commits introduced lines that needed rustfmt
reformatting. CI's `cargo fmt --check` job was blocking on this.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

crates/nuwiki-lsp/tests/link_health.rs

@@ -489,7 +489,11 @@ fn wiki_link_resolves_source_relative_first() {
         LinkSeverity::Warning,
         true,
     );
-    assert!(diags.is_empty(), "expected no diagnostics, got: {:?}", diags);
+    assert!(
+        diags.is_empty(),
+        "expected no diagnostics, got: {:?}",
+        diags
+    );
 }
 
 #[test]
@@ -500,10 +504,7 @@ fn wiki_link_falls_back_to_root_relative() {
     let root = "/tmp/srcrel2";
     let idx = build_index(
         root,
-        &[
-            ("index", "[[posts/foo|Foo]]\n"),
-            ("posts/foo", "= Foo =\n"),
-        ],
+        &[("index", "[[posts/foo|Foo]]\n"), ("posts/foo", "= Foo =\n")],
     );
     let src = "[[posts/foo|Foo]]\n";
     let ast = parse(src);