ci: switch to spiral/code-style with an auto-fixing workflow

[roxblnfk]

Q	A
Bugfix?	❌
Breaks BC?	❌
New feature?	❌
Issues	—

• Code style now comes from spiral/code-style (replaces the direct friendsofphp/php-cs-fixer dependency and the custom PSR-12 config); src, tests and the config itself are covered, risky rules are off.
• The dry-run cs.yml check is replaced by the shared cs-fix workflow, which commits fixes back to the branch.
• Composer scripts: cs:diff / cs:fix replace cs; the README is updated accordingly.
• The second commit is pure formatting from composer cs:fix (empty class bodies, \Mockery instead of an import, trailing commas, data providers moved above tests); the test suite and psalm pass locally afterwards.

[coderabbitai]

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• Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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