feat: add uv-based project with pytest and CI workflow

- Add pyproject.toml and uv.lock for Python project with uv
- Add src/__init__.py with add(), multiply(), greet() functions
- Add tests/test_example.py with unit tests
- Add commit-message skill for Conventional Commits
- Add Gitea Actions workflow to run pytest

pyproject.toml

@@ -0,0 +1,14 @@
+[project]
+name = "explore-agentic"
+version = "0.1.0"
+description = "A sample Python project"
+requires-python = ">=3.11"
+dependencies = []
+
+[project.optional-dependencies]
+test = ["pytest>=8.0.0"]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+python_files = ["test_*.py"]
+python_functions = ["test_*"]