Add Mago 1.47.4 quality checks without a baseline

[WalterWoshid]

Adds Mago 1.47.4 as a pinned development dependency and gates CI on formatting, linting, static analysis, and callback type-patch regression tests. Source targets PHP 8.1; the test configuration targets PHP 8.2 for the existing readonly fixtures.

The cleanup applies consistent formatting, corrects type declarations and PHPDoc, adds necessary runtime guards, and updates test fixtures. No baseline is created. Two narrowly checked PropertyAccess expectations remain for four diagnostics involving runtime property names; MAGO.md explains their scope. The dependency-injection callback exception is replaced with a generic vendor type patch that preserves default callback validation. Valid callbacks pass and all four invalid callback fixtures are rejected.

Discarded plugin experiments are removed. Performance fixtures now use a shared interface and reflection for construction; loading measurements should only be compared against runs with the same harness. Method-execution measurements are unchanged.

Validation:

• Mago formatter, linter, analyzer, and callback regression checks pass locally.
• PHP 8.1–8.5 functional and performance suites completed without failures during the cleanup.
• Final functional run: 80 tests, 666 assertions; existing incomplete tests and dependency deprecations remain.
• Upstream Mago and PHP 8.1–8.5 tests passed: https://github.com/okapi-web/php-aop/actions/runs/33982351182
• Origin PHP 8.1–8.5 performance matrix passed: https://github.com/WalterWoshid/php-aop/actions/runs/33982351189