Phase 4 cleanup: migrate old tests to PHPUnit, add ErrorHandler/PureLogic/SearchController tests, remove app/tests/, update justfile test target

TODO.md

@@ -25,11 +25,11 @@
 - [x] 3.3 `AutofocusFieldForErrorTest.php` — correct field per error key, unknown key returns null/default, no CreateController name leak
 
 ## Phase 4 — Cleanup
-- [ ] 4.1 Migrate 8 existing custom-runner tests to PHPUnit in `tests/phpunit/`
-- [ ] 4.2 Verify all pass under `vendor/bin/phpunit`
-- [ ] 4.3 Remove `run-tests.php` and old test files
-- [ ] 4.4 Add `vendor/bin/phpunit` to justfile/Makefile CI target
-- [ ] 4.5 Generate baseline coverage report (`--coverage-html coverage/`)
+- [x] 4.1 Migrate 8 existing custom-runner tests to PHPUnit in `tests/phpunit/`
+- [x] 4.2 Verify all pass under `vendor/bin/phpunit`
+- [x] 4.3 Remove `run-tests.php` and old test files
+- [x] 4.4 Add `vendor/bin/phpunit` to justfile/Makefile CI target
+- [ ] 4.5 Generate baseline coverage report (`--coverage-html coverage/`) — needs Xdebug/PCov
 - [ ] 4.6 Commit coverage baseline
 
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