Cleanup: Remove misleading "main" field from monorepo root package.json

Description

The root package.json currently defines a "main": "index.js" field.

However, this repository is a monorepo and is marked as "private": true, meaning it is not intended to be consumed as a package. In this context, the "main" field is misleading and unnecessary.

Why this matters

• The "main" field is typically used to define the entry point of a published package.
• In a monorepo setup, especially one that is private, this can cause confusion for tooling or developers trying to interpret the package structure.
• There is no clear use of the root as an importable module.

Proposed Solution

Remove the "main" field from the root package.json to better reflect the repository structure and avoid ambiguity.

Additionally, the "author" field is currently empty and could either be removed or properly defined for consistency.

I can work on this and submit a PR if this approach is acceptable.

Open the repository-root package.json and inspect the existing package metadata, especially the private flag and main and author fields. Remove the misleading main field as proposed, resolve the empty author field consistently with the issue discussion, and verify that the resulting JSON remains valid and the root metadata still matches the monorepo setup.