Remove stray code fence in README.md that created blank copyable section

Agent-Logs-Url: https://github.com/githubnext/autoloop/sessions/59cd435f-1855-422e-90ef-f02dee3126b8

Co-authored-by: mrjf <180956+mrjf@users.noreply.github.com>

Author: Copilot

README.md

@@ -140,7 +140,6 @@ Programs can be **open-ended** (run indefinitely, always optimizing) or **goal-o
    python3 .autoloop/programs/my-experiment/code/evaluate.py
    ```
    The metric is `score`. **Higher is better.**
-   ```
 
 3. The next scheduled run picks it up automatically. No other configuration needed.