feat(bin): extend console and server

examples/blog/bin/server

@@ -1,6 +1,18 @@
 require_relative '../app'
 
-server = Prism::Server.new(Blog, port: (ARGV[0] || 3000).to_i).start
+# A hard cap on the total number of live WebSocket connections this
+# process will hold open at once (across every post's /cable stream
+# combined), distinct from PostActivityChannel::MAX_VIEWERS_PER_POST which
+# only bounds a single stream - without this, enough popular posts could
+# still exhaust the process's file descriptors even though no individual
+# post ever hits its own per-stream limit.
+MAX_WEBSOCKET_CONNECTIONS = 2000
+
+server = Prism::Server.new(
+  Blog,
+  port: (ARGV[0] || 3000).to_i,
+  max_websocket_connections: MAX_WEBSOCKET_CONNECTIONS
+).start
 puts "listening on #{server.url}"
 trap('INT') { server.stop; exit }
 sleep