Enable page-intent when referral traffic data exists

[cwjwisse]

Summary

• add conditional page-intent enablement in llmo-referral-traffic when Athena returns referral traffic rows
• skip enabling when no OpTel/RUM rows exist
• no-op when page-intent is already enabled
• continue audit flow if enabling fails (warn log)

Tests

• npx c8 --check-coverage=false mocha --spec test/audits/llmo-referral-traffic.test.js
  • 4 passing

Notes

• This keeps page-intent tied to observed referral traffic availability.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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