The code reviewer prompt was minimal and didn't specify worktree setup,
causing parallel reviewers to interfere with each other by checking out
different branches in the same directory.
Changes:
- Add worktree setup/cleanup to code reviewer prompt (like issue-worker/fixer)
- Add branch tracking to issue state
- Add note about passing branch name to reviewers
- Expand reviewer prompt with full review process
This ensures each reviewer works in isolation at:
../<repo>-review-<pr-number>
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>