Initial SERMO-BBS: a telnet PC that boots SERMO-DOS

A rubbs-based telnet server that drops every caller into a simulated PC:
it POSTs, boots, loads SERMO-DOS, and lands at a C:\> prompt. Built-in DOS
commands (VER/DATE/TIME/ECHO/MEM/DIR/CLS/HELP/EXIT) behave; anything else
is routed to Sermo::Oracle as a question — the hook for a future LLM.

Built on rubbs' configurable BBS::FakeOS engine; the whole OS lives in
lib/sermo/dos.rb as a FakeOS.define block, so new character-mode OSes are
added as config files, not engine changes.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lib/sermo/oracle.rb

@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+module Sermo
+  # The conversational core of SERMO-DOS.
+  #
+  # Anything typed at the C:\> prompt that is not a built-in DOS command is
+  # routed here (via the FakeOS `on_unknown` hook). For now it returns canned,
+  # in-character replies so the machine feels alive.
+  #
+  # THIS IS THE LLM INTEGRATION POINT: to make SERMO actually think, replace
+  # the body of `answer` with a call to your model (e.g. the Claude API) and
+  # return its text. Nothing else in the project needs to change.
+  module Oracle
+    def self.answer(question, _ctx = {})
+      text = question.to_s.strip
+      case text.downcase
+      when /\b(hello|hi|hey|szia|hell[oó])\b/
+        'Greetings, caller. SERMO-DOS is listening.'
+      when /\bwho are you\b/, /\bmi vagy\b/
+        'I am SERMO-DOS — a conversational disk operating system.'
+      when /\b(thanks|thank you|k[oö]sz)\b/
+        'You are welcome.'
+      else
+        [
+          'My conversational core is not yet connected to a brain.',
+          %(You said: "#{text}"),
+          '(Wire Sermo::Oracle.answer to an LLM to make me think.)'
+        ].join("\n")
+      end
+    end
+  end
+end