v0.8.0

• New eval cases: c7 fixup targeting (fixes land in the commits that
  introduced them, messages preserved), c8 allow-no-verify standing consent,
  c9 hook rejection without consent stops cleanly.
• Standing consent clarified: allow-no-verify = true in .preen.toml is
  the user's explicit permission, granted ahead of time; a hook rejection is
  retried with --no-verify and the bypass is noted in the report.
• Demo: third scenario shows --fixup folding review fixes into the commits
  that introduced them; assets/demo.gif regenerated.
• Eval harness pins the skill under test: the prompt names the fixture's own
  SKILL.md and declares it overriding, so a user-level skill copy or an
  installed preen plugin can no longer shadow the version being evaluated.