v2.29.1

Fixed

• push-preview: an unreadable push is held as unreadable. Under
  deny a push whose shape cannot be read is still held, but it no longer
  says "no approved preview covers" or gives the preview steps. It names
  the shape and its own remedy: push the ref by name, in its own command.
  The most common case is git tag v1 && git push origin v1, judged
  before the tag exists; that shape now says so. A push of an existing tag
  needs no preview, as before. The missing-directory hold no longer gets
  the preview steps either (Confirmed::YesSaying gains remedy).
• preview register on the default branch itself. A commit that is
  its own merge base (tagging main) no longer fails with
  `git diff <c>..<c>` failed; an empty range is no screen.

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What's Changed

• fix(preview): unreadable holds, register on main by @fredericrous in #82
• chore: release 2.29.1 by @fredericrous in #83

Full Changelog: v2.29.0...v2.29.1