chore: clean and fix lint/test setup

Author: aime-n

poetry.lock

@@ -32,12 +32,14 @@ loguru = "^0.7.3"
 cruft = "^2.16.0"
 flake8 = "^7.2.0"
 bandit = "^1.8.5"
+coverage = "^7.9.1"
 
 [tool.poetry.group.dev.dependencies]
 black = "^25.1.0"
 isort = "^6.0.1"
 pytest = "^8.4.0"
 mypy = "^1.16.1"
+coverage = "^7.9.1"
 
 [build-system]
 requires = ["poetry-core>=2.0.0,<3.0.0"]