Own Playground SQLite alias packaging

[chubes4]

Summary

• Own Playground SQLite package alias compatibility inside Codebox by installing @wp-playground/wordpress-builds with the Playground runtime package.
• Add a Codebox normalizer that creates sqlite-database-integration-trunk.zip from Playground's shipped SQLite ZIP during installs and release packaging.
• Extend package smoke coverage so clean package contents and plugin/release artifacts include the normalizer and normalized trunk alias.

Fixes #442.

Verification

• npm install
• npm run build
• npm run playground-sqlite-alias-smoke
• npm run package-distribution-smoke
• npm run boot-preview-smoke
• npm run check progressed through build, package distribution, artifact/runtime smokes, and timed out after 15 minutes while running recipe-bench-smoke.

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode (GPT-5.5)
• Used for: Implemented the Codebox packaging compatibility fix, smoke coverage, verification, and PR draft. Chris remains responsible for review and merge.