find_async_violations

Detect six classes of async/await misuse across all production projects: sync-over-async (.Result, .Wait*, GetAwaiter().GetResult()), async void outside event handlers, missing await in async methods, and fire-and-forget tasks. Returns a summary plus a per-violation list (severity error/warning, location, containing method, snippet). Skips test projects and generated code. Static analysis only — no fix suggestions.