v0.5.0

• A GitHub Projects board can be the queue. kind: github with the board's
  owner, its project number and the repo its issues live in: a task is a
  real issue that has been put on the board, assign writes the board's
  Agent field, and note, done, fail and block land on the issue's
  thread as they do anywhere else. The token wants the project scope;
  herdr-docket auth github checks it, stores it (--token ghp_… stores a PAT
  instead) and creates the Agent field with one option per agent. It is looked
  for in HERDR_DOCKET_GITHUB_TOKEN, then gh auth token, then the stored copy.
• A GitHub board is read one page of 100 at a time, in the board's own
  order: past that the tail waits for the next poll, and a pull request or a
  draft card on the board is not the fleet's work. The poll asks for titles and
  the two columns only — bodies, checklists and comments are read by
  task view — so a tick costs about one of GitHub's 5,000 hourly points
  rather than a hundred.
• The README named HERDR_FLEET_BASECAMP_CLIENT_ID and _SECRET for the
  Launchpad app. The names the code reads are HERDR_DOCKET_BASECAMP_CLIENT_ID
  and HERDR_DOCKET_BASECAMP_CLIENT_SECRET.