Add OpenCode PR review workflow

[opencode-agent]

I've created .github/workflows/opencode-review.yml that will automatically review PRs when they are:

• Opened
• Synchronized (new commits pushed)
• Reopened
• Marked as ready for review

The workflow:

• Uses the same Cloudflare AI Gateway setup as the existing opencode.yml workflow
• Uses claude-sonnet-4 for reviews (faster and more cost-effective than opus for review tasks)
• Has read-only permissions (appropriate for reviews that don't need to make changes)
• Includes a custom prompt focused on code quality, bugs, coding standards, and improvements

Closes #307

opencode session  |  github run

[changeset-bot]

⚠️ No Changeset found

Latest commit: d4633a2

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[opencode-agent]

User opencode-agent[bot] does not have write permissions

github run

[threepointone]

/oc rebase this on main

[opencode-agent]

To https://github.com/cloudflare/partykit
! [rejected] opencode/issue307-20260112182533 -> opencode/issue307-20260112182533 (non-fast-forward)
error: failed to push some refs to 'https://github.com/cloudflare/partykit'
hint: Updates were rejected because the tip of your current branch is behind
hint: its remote counterpart. If you want to integrate the remote changes,
hint: use 'git pull' before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.

opencode session  |  github run

[opencode-agent]

ProviderModelNotFoundError

opencode session  |  github run

[opencode-agent]

ProviderModelNotFoundError

opencode session  |  github run

[opencode-agent]

ProviderModelNotFoundError

opencode session  |  github run

[opencode-agent]

ProviderModelNotFoundError

opencode session  |  github run

[opencode-agent]

ProviderModelNotFoundError

opencode session  |  github run