Initial commit: extracted from impostor-bbs gems/bbs

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/bbs/server.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+require 'socket'
+
+module BBS
+  class Server
+    def initialize(port:)
+      @port = port
+    end
+
+    def run
+      server = TCPServer.new('0.0.0.0', @port)
+      puts "BBS listening on port #{@port} — connect with: telnet localhost #{@port}"
+      loop do
+        client = server.accept
+        Thread.new(client) { |c| Session.new(c).run rescue nil }
+      end
+    rescue Interrupt
+      puts "\nServer stopped."
+    end
+  end
+end