feat: make docs staleness critical, streamline review output

[russellhaering]

Summary

• Doc staleness findings (D1-D4) are now critical severity — stale docs block merge
• Streamlined summary comment template: severity counts on one line, removed verbose sections
• Inline comments kept to 2-3 sentences instead of paragraphs
• Summary references inline findings briefly instead of repeating them

Follow-up to #53 based on baton-twingate#16 output being too verbose.

[coderabbitai]

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