prhub 0.2.1

Changed

• A poll sends GitHub up to 4 requests at a time instead of one after another: the PR and commit batches, and the
  REST reads of deploy runs and containment, which are now collected across all commits first and asked once each.
  Answers keep their order, a batch GitHub times out on is still split and retried, and a secondary rate limit pauses
  polling until GitHub's Retry-After.
• The daemon remembers which PRs are open instead of reading every PR record each poll to find them (1,696 files on
  the maintainer's machine, 15/10), and sweeps old files hourly instead of every poll. A closed PR's record is deleted
  a day after it closes, not seven.
• PR records no longer carry the raw GraphQL fields (pr): nothing read them, and each file shrinks to its summary.
  Older records are still read; anything outside prhub that read pr from these files must stop.
• prhub status counts the PR records instead of reading them, and prhub wait checks for new state every second
  (--poll, was 3).
• Releases also carry thin macOS builds, macos-arm64 and macos-x86_64 (wheels and binaries), half the size of the
  universal one, which stays.