Swarm

Reviewed overlay for SN124 Swarm using the official Swarm source repository, website, and backend API docs. Root->128 accuracy audit first review pass (#5903): added website (swarm124.com, the www subdomain 301-redirects here) and source-repo surfaces, fixed 4 missing probe blocks on the pre-existing community-submitted surfaces, and added a new public no-param surface (kings/diagnostics) explicitly documented alongside the existing kings/active route. Confirmed the backend's SSE event stream and validator sync/next-task routes all require signed per-request auth headers -- not promotable.