fix(tests): load CoreTest autoload from core vendor

[MiddleSokilAI]

Problem

The new CI test job installs Composer dependencies from core/, so test dependencies and autoload.php are available under core/vendor.

CoreTest bootstrapped EVO_BASE_PATH as the repository root but still looked for vendor/autoload.php directly under that root, which makes the getTagsFromContent test group fail with Run: composer install in CI.

Root Cause

The test mixed the public repository root path with the core Composer vendor path. EVO_CORE_PATH already points at core/, so the test should use it for the Composer autoloader.

Change Summary

• Load CoreTest autoload from EVO_CORE_PATH . 'vendor/autoload.php'.
• Keep the existing EVO_BASE_PATH, EVO_CORE_PATH, storage, manager, and site URL constants unchanged.

Validation

• git diff --check

Local runtime checks were limited because PHP/Composer are not available in this Windows shell, WSL failed to start, and Docker Desktop is not running. The change directly matches the CI install layout from .github/workflows/ci.yml.

Risk

Low. The change is scoped to one unit test bootstrap path and does not affect runtime code.