Add Mentat Daemon

[waydegilliam]

The Mentat Daemon is an experiment not meant to necessarily replace Mentat, but is an alternate way to interface with Mentat that may provide a better, Copilot-like DX.

The idea is that there is a background process (the Mentat Daemon) that watches a directory for file changes. When a user changes a file, the daemon calls an LLM and inserts the code into the file where the comment was.

The daemon can be started in the command line like this:

>> mentat-daemon

Once started, a simple TUI showing file changes and LLM progress/edits is displayed. To invoke the Mentat Daemon, the user can write comments prefixed with @mentat to insert LLM-generated code. For a python file, the syntax would look like this:

# @mentat create a function for getting market quote data from yahoo finance by ticker

After the user saves the file, the Mentat Daemon will check if the current file contents contain @mentat and will generate a response that will be inserted into the line the comment is on.