[Feature]: Turn auto-boot off from composer.json #95

Proposed Feature / Syntax

A project-level way to turn auto-boot off, for example in the root composer.json:

{
  "extra": {
    "typephp": {
      "auto-boot": false
    }
  }
}

With it, src/bootstrap.php does not boot, and the project calls TypePHP::boot() where it wants checks, such as a test bootstrap file.

Motivation / Use Case

Installed as a dev dependency, TypePHP boots on every vendor/autoload.php require: the local web server, every developer's test run, every CI job. Today the only way out is TYPEPHP_DISABLE, which has to be set in every one of those environments.

It cannot be set where the tests are configured either: the PHPUnit binary requires the autoloader before it reads phpunit.xml, so an <env> entry there is too late.

We want TypePHP active in one dedicated CI job and nowhere else. Our workaround is to composer require it inside that job only.

Code Example

// tests/bootstrap.php, the only place where checks should run
require __DIR__ . '/../vendor/autoload.php';

\TypePHP\TypePHP::boot();