v0.9.0

• Go CLI wrapper: go install github.com/dcadolph/preen@latest gives a
  preen command that launches Claude Code with the skill from any
  terminal. Interactive by default; --headless runs claude -p with
  --yes and scoped permissions for CI and scripts. Flags after -- pass
  to the claude CLI verbatim.
• The binary embeds the release's SKILL.md and pins the run to that exact
  text, overriding any installed plugin or user-level skill copy, the same
  pinning the eval harness uses.
• Preflight checks fail fast before a session starts: claude on PATH,
  inside a git repository, no rebase, merge, or cherry-pick in progress.