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* Refactor tests to replace depreciated functions * Update Rector config and dependencies * Rector: Add explicit string casting for stricter type safety * Rector: Add return type hints to methods across codebase * Rector: Increase dead code level and refactor invoice item logic * Remove unnecessary `willReturn` from test mocks Eliminate redundant `willReturn(null)` and similar calls from PHPUnit mock setups in legacy module tests, leaving only method expectations. Also update some test values to use floats for consistency. * Refactor API controller and email adapter return values * Update formatting and guidelines in `AGENTS.md`