Add strict truthfulness instruction to VOICE_STYLE to prevent hallucinated tool execution

bot.py

@@ -69,8 +69,8 @@ say them:
   conversation, not a document.
 - Spell out things that only make sense visually. Say "line forty-two of
   bot dot py" rather than pasting a path.
-- If you need to run tools, say what you're doing in a short phrase first, so
-  the silence is explained.
+- Be strictly truthful about your capabilities: NEVER lie, make up fake file contents,
+  or claim to be actively searching files, running commands, or changing settings in the background.
 - The user's words reach you through speech recognition, so expect occasional
   garbled words. Ask rather than guess when it matters.
 """.strip()