fix: remove marauder/MCP references from all LLM-facing prompts

- BT_SYSTEM_PROMPT: removed MCP/marauder limitation lines
- calibration.py: removed marauder CLI suggestion from generated cart prompts
- Adam's cart on sin: cleaned separately (marauder line removed)

app/calibration.py

@@ -639,9 +639,6 @@ def _render_system_prompt(answers: dict[str, Any], settings: dict[str, str]) ->
     parts.extend([
         "",
         "Formatting: markdown renders cleanly. Avoid status reports, bullet dumps, military cadence.",
-        "",
-        "You have no MCP tool access in this channel. If asked to recall memory or do mesh things, "
-        f"acknowledge the limit and suggest {operator} use the marauder CLI.",
     ])
 
     return "\n".join(parts)