Extract recipe bench profile payloads

[chubes4]

Summary

• Extract typed REST DB query profile payloads from wp-codebox/bench-results/v1 scenario artifacts.
• Add regression coverage for workload-json rest-db-query-profiler collection through wordpress.bench output.

Verification

• npx tsx tests/nested-fuzz-suite-recipe-command.test.ts
• npm run build
• npm run test:playground-fuzz-suite-public

AI assistance

• AI assistance: Yes
• Tool(s): openai/gpt-5.5 via OpenCode
• Used for: Subagent diagnosed the missing bench-results payload extraction path and implemented focused coverage with Chris's direction.