Update comment in action.py and prompt response handling

[LeeKonyu]

This pull request includes two key updates:

1. In actions.py, removed the redundant creation of a pseudo_messages copy, streamlining the process by directly appending the summary_message to messages. This change simplifies the message handling before invoking the chat completions API.

2. Modified prompts.py to include additional command types in the prompt response examples. Added a new SEARCH command with usage guidance, and a DONE command to signify the completion of an operation. This update aims to enhance user guidance and expand the functionality of the command interface.

Changes:

• Removed unnecessary copy operation in actions.py for message handling.
• Added SEARCH and DONE commands in prompts.py to improve user interaction.

[joshbickett]

Ok, thanks for pointing these out. I'll merge this in shortly.