Fix missing BlacklistFactory import in standalone usage example

[Copilot]

The standalone usage example in README.md referenced BlacklistFactory::fromYaml() without importing Tactix\BlacklistFactory, making the snippet non-functional as-is.

Changes

• README.md: Added missing use Tactix\BlacklistFactory; to the standalone usage code example.

use Tactix\Blacklist;
use Tactix\BlacklistFactory; // added
use Tactix\Check;
use Tactix\YieldViolations;
use Symfony\Component\Yaml\Yaml;

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