Move production files under src/ directory

[remyperona]

What

Reorganize the library's production code under a dedicated src/ directory to clearly separate shipped code from the package's own test suite (Tests/), tooling (bin/, wpmedia-phpunit), and configuration.

src/
├── ArrayTrait.php
├── BootstrapManager.php
├── TestCaseTrait.php
├── VirtualFilesystemDirect.php
├── VirtualFilesystemTestTrait.php
├── bootstrap-functions.php
├── Fixtures/polyfills.php
├── Integration/   (TestCase, traits, bootstrap.php, phpunit.xml.dist, …)
└── Unit/          (TestCase, bootstrap.php, phpunit.xml.dist, …)

Tests/, bin/, wpmedia-phpunit, and root config/dotfiles are unchanged in location.

Config updated to follow the move

• composer.json — PSR-4 WPMedia\PHPUnit\ now maps to src/; added an autoload-dev mapping WPMedia\PHPUnit\Tests\ → Tests/ so the self-tests still autoload.
• wpmedia-phpunit — requires src/BootstrapManager.php.
• BootstrapManager — __DIR__-relative lookups (consumer's vendor/bin/phpunit and root dir) each gained one dirname() for the extra directory level.
• src/{Unit,Integration}/phpunit.xml.dist — relative Tests/ paths bumped by one level.
• Tests/{Unit,Integration}/init-tests.php — require the bootstrap from src/.

Public namespaces are unchanged, so consumers extending WPMedia\PHPUnit\Integration\TestCase / WPMedia\PHPUnit\Unit\TestCase are unaffected. CI workflows and README needed no changes.

Testing

• Every move is a clean git rename.
• composer test-unit → OK (91 tests, 282 assertions), matching the pre-change baseline.
• php -l clean on all touched files; autoloader regenerates to the new paths.

🤖 Generated with Claude Code