fix: add missing use statements in README usage snippet

[Copilot]

The README code snippet instantiated YieldViolations and Blacklist without importing them, making the example non-runnable as written.

Changes

• Added use Tactix\Blacklist and use Tactix\YieldViolations to the manual-check usage snippet

use Tactix\Blacklist;
use Tactix\Check;
use Tactix\YieldViolations;

$check = new Check(new YieldViolations(new Blacklist(Blacklist::DEFAULT_DATA)));
$check->className(User::class);

// or:
$check->folder(__DIR__.'/src');

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