The docs described one specific deployment by hostname, reading as though
arti-pack only works there. It works against any HTTP artifact repository that
serves a tag archive at a stable URL.
- describe the registry as any HTTP artifact repository, with Artifactory as
the worked example
- use a placeholder host in every configuration and URL example
- state that registry must be set, since the shipped default is site-specific
- add lua modules for spec parsing, lock state, fs helpers and the installer
- add ArtiPackSync/ArtiPackClean/ArtiPackList commands and help doc
- add headless nvim test harness and specs
- add make test/lint/fmt/pre-commit and patch/minor/major bump targets
- add woodpecker test, lint and pre-commit pipelines