fix: proper tox/pytest setup — remove skip_install, split dependency groups

- Remove skip_install=true and manual deps list from tox.ini; use
  dependency_groups = test so tox installs the package (and its deps)
  from pyproject.toml properly
- Split dependency-groups into test (pytest, pytest-cov) and dev (tox,
  pyyaml, git-cliff); drop unused pyfiglet
- Add pythonpath = ["src"] to pytest config as safety net for direct runs

Author: dacrystal

pyproject.toml

@@ -36,16 +36,11 @@ force-include = {"src/devcode.py" = "devcode.py", "src/templates" = "dev_code_te
 
 [tool.pytest.ini_options]
 testpaths = ["tests"]
+pythonpath = ["src"]
 
 [dependency-groups]
-dev = [
-    "pytest>=7.0.1",
-    "pyfiglet>=1.0.4",
-    "pytest-cov>=4.0",
-    "tox>=4.0",
-    "pyyaml>=6.0",
-    "git-cliff>=2.0",
-]
+test = ["pytest>=7", "pytest-cov>=4"]
+dev = ["tox>=4", "pyyaml>=6", "git-cliff>=2"]
 
 [tool.hatch.metadata.hooks.fancy-pypi-readme]
 content-type = "text/markdown"

tox.ini

@@ -2,11 +2,6 @@
 envlist = py310, py311, py312, py313
 
 [testenv]
-skip_install = true
-deps =
-    pytest
-    pytest-cov
-    pyfiglet
-    click>=8.0
+dependency_groups = test
 commands =
     pytest --cov=src --cov-report=term-missing --cov-report=xml