fix(diagnostics): sort by severity before truncating

Errors appear first, then warnings, info, hints. Ensures the most
actionable issues survive the cap instead of being pushed out by
low-priority hints.

index.ts

@@ -219,6 +219,10 @@ function formatDiagnostics(result: unknown, limit = 20): string {
     4: "Hint",
   };
 
+  // Sort By Severity - Errors first, then warnings, info, hints. Ensures
+  // the most actionable issues survive truncation.
+  diags.sort((a: any, b: any) => (a.severity ?? 99) - (b.severity ?? 99));
+
   const shown = diags.slice(0, limit);
   const formatted = shown
     .map((d: any, i: number) => {