Additions and tweaks to the aichat CLI.

These are some personal aliases, shortcuts, and extensions that make (my) work with the all-in-one LLM CLI tool command-line utility aichat easier and faster. Some of them may be specific to my environment and workflow, but maybe someone finds a valuable nugget in there.

Download all / some selected extensions (note that some have dependencies, though) and put them somewhere in your PATH, or just add the ./bin subdirectory to PATH. You can then invoke them via aichat-SUBCOMMAND.

It is recommended to also use the (Bash, but should also work in Korn shell and Dash) shell functions (e.g. in your .bashrc) found at shell/wrappers.sh to transparently invoke the extensions in the same way as the built-in aichat commands, via aichat SUBCOMMAND.

• The shell/aliases.sh script (meant to be sourced in .bashrc) defines Bash aliases around the provided commands.
• The shell/bash/completions.sh script (meant to be sourced in .bashrc) defines Bash completions for the provided commands.
• The shell/wrappers.sh script (meant to be sourced in .bashrc) defines Bash wrappers around provided commands (for additional features in the current shell).