ci: move Claude PR Review continue-on-error to step level

[shuheng-liu]

What this does

Follow-up to #291. The previous PR put continue-on-error: true at the job level on the review job, but GitHub's job-level flag only changes the workflow run's overall conclusion — the per-job check status still reflects the job's actual outcome, so the review check on a PR still showed ❌ when the action rate-limited (e.g. #292 run 25751881797). Moving the flag down onto the anthropics/claude-code-action@v1 step instead masks the failure before it propagates to the job's conclusion, so the check run reports success and the per-commit ✓/✗ rollup goes green. Drops the now-redundant job-level flag.

How it was tested

• Single-line move, verified diff is exactly -continue-on-error: true at the job and +continue-on-error: true on the action step.
• pre-commit run --files .github/workflows/claude-pr-review.yml — clean (yaml/zizmor/gitleaks/typos).
• End-to-end behavior will be exercised by this PR itself: after merge, a fresh PR that hits the rate limit should report the review check as green.

How to checkout & try? (for the reviewer)

git fetch origin claude/ci-pass-step-level-continue-on-error
git checkout claude/ci-pass-step-level-continue-on-error
git diff main -- .github/workflows/claude-pr-review.yml

Checklist

• I have added Google-style docstrings to important functions and ensured function parameters are typed.
• My PR includes policy-related changes.
  • If the above is checked: I have run the GPU pytests (pytest -m "gpu") and regression tests.

Note: Before submitting this PR, please read the contributor guideline.

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