fix-6: raise ring display cap to 5000 (viewer + Entries clamp); viewer default limit 1000

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017CDMFpFx84pfviCTVuGGhf

controller/internal/web/handler_debug.go

@@ -513,7 +513,8 @@ func (s *Server) debugLogBuffer(w http.ResponseWriter, r *http.Request) {
 
 	limit := 200
 	if v := r.URL.Query().Get("limit"); v != "" {
-		if n, err := strconv.Atoi(v); err == nil && n > 0 && n <= 1000 {
+		// fix-6: allow up to the ring capacity (5000) so the viewer can pull the full retained window.
+		if n, err := strconv.Atoi(v); err == nil && n > 0 && n <= 5000 {
 			limit = n
 		}
 	}