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

[Coder-soft]

Summary

Point the opencode review bot at the OpenCode Go provider and add a /review trigger.

• Use opencode-go/deepseek-v4.1-flash instead of the free Zen model opencode/minimax-m2.5-free.
• Add /review (alongside /oc and /opencode) as a comment trigger via the job if gate and the action's mentions input.
• Keep automatic PR review on opened / synchronize / reopened / ready_for_review, and comment-triggered behavior on issues and PR review comments.

Setup required after merge

1. Add an OPENCODE_API_KEY repository secret (OpenCode Go key from https://opencode.ai/auth):
   gh secret set OPENCODE_API_KEY --repo creatorcluster/renderdragon.org
2. Ensure the OpenCode GitHub App (https://github.com/apps/opencode-agent) is installed on this repo.

Notes

• GitHub does not pass secrets to pull_request workflows triggered from forks, so automatic on-open review only authenticates for same-repo PRs. /review comments run from the base repo's default branch and therefore work reliably for cross-fork PRs.
• Trigger words must be at the start of a comment or preceded by a space.

Summary by CodeRabbit

• Improvements
  • Review runs can now be triggered with /review in issue comments, alongside the existing commands.
  • Updated the model used for automated reviews.

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Note

Currently processing new changes in this PR. This may take a few minutes, please wait...

⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: b2464994-3628-4350-a8c9-bedc2064f0ff

📥 Commits

Reviewing files that changed from the base of the PR and between 3655cb0 and 0462beb.

📒 Files selected for processing (1)

• .github/workflows/opencode.yml

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create a new PR

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