Code review completed for raw body bytes capture PR

[Copilot]

Completed code review of PR #8065 which implements raw request body preservation for v4 HMAC authentication in BitGo Express.

Review findings:

• Implementation verified correct: Raw body buffer capture via body-parser's verify callback occurs before JSON parsing, preserving exact bytes for signature verification
• Type safety confirmed: rawBodyBuffer properly typed as optional Buffer in Express Request interface extension
• Backward compatibility maintained: sendRequestBody helper falls back to parsed body when raw buffer unavailable
• Minor suggestions provided:
  • Empty body edge case handling
  • Content-Type header preservation considerations
  • Additional inline documentation for HMAC context

No blocking issues identified. Changes are minimal and focused on the stated authentication requirement.

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