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

[jnasbyupgrade]

Summary

• Same issue as claude-code-review.yml: add missing --comment flag pgxntool-test#61 and claude-code-review.yml: add missing --comment flag pgxntool#84: the /code-review plugin only prints its findings to the job log by default; it needs --comment to post a PR comment. This workflow's prompt was missing that flag, so every automated review has run (real API cost, correct analysis) but never posted anything visible to the PR.
• Root cause confirmed on the pgxntool-test side by temporarily enabling show_full_output 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." Adding --comment fixed it there; this is the same one-line fix ported here unchanged.

Test plan

• This change only affects a GitHub Actions workflow file.
• The fix was live-verified against pgxntool-test's identical workflow before being ported here unchanged.

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