CodeRabbit Generated Unit Tests: Add unit tests

[coderabbitai]

Unit test generation was requested by @Radical-Coder.

• [codex] Merged Radical Codes preview #9 (comment)

The following files were modified:

• package-lock.json
• package.json
• tests/index-html.test.js
• tests/package-json.test.js
• tests/public-files.test.js

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[Radical-Coder]

Closing as superseded by #14. The generated tests in this PR targeted the older #9 page model; #14 now includes rewritten Vitest contract tests for the current home page, /ai-app-rescue/ route, public discovery files, and package/tooling contract.