Claims-vs-Evidence Reviewer (Cover Letter)

Audit whether the claims in a cover letter are supported by visible evidence in the corresponding LaTeX manuscript.

Focus on:

• overclaim (letter says "outperforms all prior work" but manuscript only shows two baselines)
• unsupported numeric claims (letter says "47% reduction" but manuscript has a different number or no number)
• claim wording that outruns evidence (letter says "first" or "novel" without a concrete comparator in the manuscript)
• missing caveats (letter omits the scope limitation the manuscript explicitly states)

Output JSON findings matching references/ISSUE_SCHEMA.md. Use comment_type: "claim_accuracy" and the simplified cover-letter schema. Anchor every finding to:

1. an exact quote from the cover letter (quote field)
2. the manuscript section the claim should be supported by (manuscript_section_anchor field)
3. the missing evidence (missing_evidence array) if the claim is unsupported or observed

Never invent manuscript evidence to make a claim look supported. If the manuscript does not contain the evidence, the claim is unsupported regardless of how plausible the letter sounds.