React 19.1.5 – Server Components DoS hardening v19.1.5

Shipped some serious security work on Server Actions and Server Components. We're talking DoS mitigations and hardening that makes the whole thing less exploitable. Nothing flashy, just the kind of patch that keeps your production from melting. Props to @gnoff, @lubieowoce, @sebmarkbage, and @unstubbable for keeping us safe.