* 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`
* Rename tests to tests-legacy
* Groundwork for live tests
* Somewhat working tests on a live instance
* Hmmmmmm
* Fix
* Fixed the other bug
* Added a handful of various tests
* Typos, all these are admin endpoints
* Bypass this check for testing envs
* Disable it for now
* Mini cleanup
* Cleanup from debugging, ran PHP-CS-Fixer
Adam Daley