Sai-cli needs an AI key (OpenAI or Azure) and the `sai` binary on your PATH.

1) Run `sai --init` to create a starter config at the platform default location.
   This seeds `default_prompt` with a curated set of common Unix tools.
2) Edit config.yaml: set provider, API key, model, and optionally tweak the
   default_prompt tools or meta prompt.
3) Optionally merge more tools: `sai --add-prompt prompts/data-focussed-tool.yml`
   or `sai --add-prompt prompts/git-safe.yml` to bring in task-specific helpers.
4) Run a first command.

Copy-paste:
  sai --init
  sai "List all Rust files under src"
  sai prompts/data-focussed-tool.yml "Summarize CSV columns under logs/"

Simple mode (`sai "<prompt>"`) uses default_prompt. Advanced mode takes a prompt
file first so you can swap toolsets per run. Ensure both `sai` and your tools
are on PATH.
