v0.1.0

Added

• git::remote prints the remote this repository belongs to, resolved from
  checkout.defaultRemote, then the current branch's remote, then a sole remote. It refuses
  when several exist and nothing says which.
• git::tags_at_head prints the release tags on HEAD, highest version first.
• git::assert_tag_version <version> refuses unless a tag on HEAD names that version.
• git::assert_tag_free <tag> refuses unless the remote definitely does not carry the tag.
  A failure to ask the remote is a refusal, not a yes.
• git::assert_on_branch [branch] refuses unless the branch already took HEAD, and refuses
  outright on a shallow clone rather than answering from truncated history.
• github::assert_on_branch [branch] [commit] answers the same question over the compare
  API, which needs no local history.
• github::await_workflow <sha> <workflow> waits for one workflow's run on a commit.
• github::assert_release_absent <tag> refuses a tag whose release already carries assets.
• github::dispatch <owner/repo> <event> [key=value ...] sends a repository_dispatch event.
• changelog::section <version> [file] prints one version's changelog section.
• net::status <url> prints an HTTP status code; net::await_url <url> waits for a URL to
  serve, backing off across about 7.75 minutes.
• release::prechecks <version> runs the shape, the working tree, the tag, the ordering and
  optionally the branch and a registry URL.
• install.sh links rt alongside releasetools, and leaves a name it did not create.

Changed

• git::latest_version and git::release --push use git::remote instead of assuming
  origin.
• git::release reuses a tag that already points at HEAD instead of failing, so a retry
  after a failed push no longer needs --force. It refuses a tag pointing anywhere else,
  and refuses to reuse an unsigned tag when --sign was asked for.
• base::check_deps now reports on changelog::, net::, release:: and a github::
  that requires gh, so it fails on a machine without the GitHub CLI.

Removed

• github::get_version. A GitHub-wide code search found its definition and one docs page
  and no caller. v$(rt git::version_tag) replaces it, and --env becomes
  echo "VERSION=v$(rt git::version_tag)" >>"$GITHUB_ENV".