Engineers use different LLM providers (Anthropic/OpenAI/OpenRouter/...); the
package does not pin a provider or model. install.sh now accepts any known
provider key and README states provider-agnosticism explicitly.
- checks Node >= 20, installs Pi if missing, runs pi install with PI_KIT_REPO (single source of the repo address, no version ref)
- verifies API key env var (Anthropic/proxy TODO), prints where to get it
- prints cheat sheet: run, update, commands, internal course link (TODO)
dev