`cht:augment` with Last Messages

Include latest logs in augmented prompt:

./btlr cht:augment \
  --config-augmented-prompt-template-filename ./templates/cht/prompts/augmented.txt \
  --config-llm-engine "chatgpt-gpt-3.5-turbo" \
  --config-last-messages-filename ./var/cht/logs/last_messages \
  --manual-mode true