#105 ci: add opencode review workflow (floating v1)

Summary

• Adds .github/workflows/opencode-review.yml calling the opencode-review-threads reusable review workflow pinned to floating v1.
• Supersedes #104, which conflicted with the bespoke opencode.yml on main; this keeps the existing interactive workflow untouched.
• Uses github-actions[bot] authorship (use-github-token) with the org cf:/zen: model chains.

Test plan

• Review run fires on this PR

Generated with Devin

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Summary by cubic

Adds a GitHub Actions workflow that runs opencode review on pull request updates, skipping the opened trigger to avoid duplicate reviews with the existing opencode.yml.

• Calls the reusable tonythethompson/opencode-review-threads workflow pinned to floating v1.
• Reviews and fixes as github-actions[bot] using the configured cf:/zen: model chains.
• Keeps the existing interactive opencode.yml untouched, superseding #104 which conflicted with it.

Summary by CodeRabbit

• Chores
  • Automated code reviews now run for pull requests when they are reopened, updated with new changes, or marked ready for review. Opening a pull request by itself no longer starts a review. The review workflow’s other behavior and settings are unchanged, so eligible pull request updates continue to be reviewed automatically.