Wait for marketplace checks before merge

[sf-jin-ku]

Summary

• wait for marketplace PR checks to finish before trying the admin merge
• keep the release sync flow fully automated for protected codex-plugins main

Testing

• ruby -e 'require "yaml"; YAML.load_file(".github/workflows/release-sync.yml"); puts "ok"'
• git diff --check -- .github/workflows/release-sync.yml

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Handle empty-check race before watching PR checks

This step runs immediately after creating/updating the marketplace PR, but gh pr checks --watch does not wait for checks to be created if none exist yet; in gh it first fetches checks and returns an error (no checks reported on the '<branch>' branch) when the initial list is empty, so watch mode never starts. That creates an intermittent failure window right after PR creation when GitHub hasn’t registered check runs yet, causing the release-sync job to fail before gh pr merge can run.

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