ci: run opencode review bot on OpenCode Go with /review trigger

[creatorcluster]

Summary

Add the OpenCode review bot workflow for this repository.

• Runs the opencode agent on opencode-go/deepseek-v4.1-flash (OpenCode Go).
• Automatically reviews pull requests on opened / synchronize / reopened / ready_for_review.
• Responds to /review, /oc, and /opencode comments on issues and pull requests.

Setup required

1. Repository secret OPENCODE_API_KEY (OpenCode Go key from https://opencode.ai/auth).
   On the GitHub Free plan, organization secrets are not readable by private repos, so private repos need their own repository secret.
2. The OpenCode GitHub App (https://github.com/apps/opencode-agent) installed on this repository so the action can post review comments.

Notes

GitHub does not pass secrets to pull_request workflows triggered from forks, so /review comments (which run from the base repo's default branch) are the reliable path for cross-fork PRs. Trigger words must start the comment or be preceded by a space.

[coderabbitai]

Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

⚙️ Run configuration

• Configuration used: defaults
• Review profile: CHILL
• Plan: Advanced
• Run ID: 6e1ec220-1813-4ca3-b4fa-561e05036ef5

• Autopilot · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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