Add Liberal Radicalism research entry

[2js56]

/claim #299

Summary

• Add the Liberal Radicalism paper as a Gitcoin 30 research entry.
• Add GBOYEE to authors.json so the submitted author resolves during validation.
• Generate the required Chladni banner at /content-images/research/liberal-radicalism-paper/banner.png.

Validation

• node -e "JSON.parse(require('fs').readFileSync('src/data/authors.json','utf8')); console.log('authors ok')"
• npx tsx scripts/validate-content.ts src/content/research/liberal-radicalism-paper.md
• git diff --check

Fixes #299.

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