Huddle 0.4.1

Fixed

• The progress Issue is updated again (Issue #69). Since 0.4.0 the labels job printed «Progress not updated: now.getTime
  is not a function»: the real ctx.now() returned milliseconds for the update notice, while progress expected a Date.
  ctx.now() is now a Date everywhere, the update notice reads its milliseconds, and every test clock comes from one
  fakeNow with the real shape. A new test runs the real context from lib/cli/main.mjs.
• Setup no longer adds a second labels job (Issue #70). It finds the one a project already runs by what it does (a
  workflow, or .gitlab-ci.yml and the local files it includes, that runs huddle labels), keeps it, and says so in its
  notes. When that job pins an older Huddle in HUDDLE_REF (a tag, or a SHA with its tag in a comment), the notes say to
  update it in a PR; a SHA without a tag gets a note to check it.