feat: implement linting and testing

pyproject.toml

@@ -27,4 +27,35 @@ attribute = "defs"
 dev = [
     "pytest",
     "dagster-webserver",
+    "pre-commit",
+    "ruff",
+    "sqlfluff",
+    "sqlfluff-templater-dbt",
 ]
+
+[tool.ruff]
+target-version = "py311"
+line-length = 100
+
+[tool.ruff.lint]
+select = [
+    "E",   # pycodestyle errors
+    "W",   # pycodestyle warnings
+    "F",   # pyflakes
+    "I",   # isort
+    "UP",  # pyupgrade
+    "B",   # flake8-bugbear
+    "SIM", # flake8-simplify
+    "C4",  # flake8-comprehensions
+]
+ignore = [
+    "E501",  # line too long – handled by formatter
+    "B008",  # function call in default argument (Dagster configs use this)
+]
+
+[tool.ruff.lint.isort]
+known-first-party = ["data_platform"]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+addopts = "-v"