[ephpicman]

Summary

• Port the existing WordPress query argument builders from Vertex Framework into this standalone package.
• Provide fluent builders for the core WordPress query APIs.
• Preserve all constructor-supplied arguments and provide set() / setMany() pass-through methods for additional core and custom query variables.
• Complete date query helpers, including array-valued date parts and comparison operators.
• Correct Comment Query author inclusion/exclusion argument names.
• Preserve WordPress argument types, including multiple user meta keys.
• Include PHPUnit tests, Composer metadata, package documentation, and a PHP compatibility CI matrix.

Scope

This PR provides argument builders only. Builders produce arrays for WordPress APIs; they do not execute queries or provide an ORM. WordPress remains responsible for interpreting the arguments and running the query.

It does not add direct SQL access, custom-table CRUD, repositories, models, or migrations.

Validation

GitHub Actions runs Composer validation and the unit suite across PHP 8.0–8.5.