Fix OpenCode inline review fallback warning

[seonghobae]

Summary

• remove the missing warn_gh_publication_failure dependency from the inline review fallback path
• keep the OpenCode suggested diff contract unchanged: structured findings use GitHub review comments, and fallback reviews explain why inline anchoring failed

Validation

• git diff --check
• Ruby YAML parse for .github/workflows/opencode-review.yml
• contract marker check for create_pull_review_with_payload, comments array, suggested diff body, and fallback warning

[github-actions]

OpenCode Review Overview

• Head SHA: 5c55b0dcc78f27afc855a612d79a198e119a908a
• Workflow run: 27900079066
• Workflow attempt: 1
• Gate result: APPROVE (exit 0)

[opencode-agent]

OpenCode Agent approved this PR.

The change in the workflow script replaces a call to warn_gh_publication_failure with the function's body, which is safe because the function's behavior is preserved and the added event variable in the message improves context. The function remains defined and used elsewhere appropriately.

• Result: APPROVE
• Reason: Change replaces a function call with equivalent inlined code, improving clarity by including the event type. No functional, security, or privacy issues found.
• Head SHA: 5c55b0dcc78f27afc855a612d79a198e119a908a
• Workflow run: 27900079066
• Workflow attempt: 1