CI: add missing --comment flag to claude-code-review.yml

[jnasbyupgrade]

Summary

The /code-review plugin only prints its findings to the job log by default; it needs --comment to actually post a PR comment. claude-code-review.yml's prompt was missing that flag, so every automated review ran (real API cost, correct analysis) but never posted anything visible on the PR.

Confirmed by capturing the hidden SDK transcript on a canary PR with a deliberately injected bug: the review agent found the bug correctly, but its own final line read "No --comment argument was provided, so no GitHub comments were posted."

Test plan

• This change only affects a GitHub Actions workflow file.
• Verified --comment fixes the missing-comment behavior against a live canary PR.

[coderabbitai]

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