chore: remove dead tox.ini, fix Makefile and pyproject.toml

- Delete tox.ini (listed py38/39/310, referenced non-existent
  requirements_dev.txt, used tox 3 syntax -- dead code)
- Remove /requirements/* from sdist includes (directory doesn't exist)
- Update Makefile: dev-install uses uv sync, update-deps uses uv lock,
  lint uses ruff, release removes non-existent pin_dependencies.py,
  test-all documents CI-only multi-version testing, clean-test drops .tox
- Add ruff to dev dependency group so make lint works before Ruff config migration

Author: jstvz

Makefile

@@ -40,20 +40,20 @@ clean-pyc: ## remove Python file artifacts
 	find . -name '__pycache__' -exec rm -fr {} +
 
 clean-test: ## remove test and coverage artifacts
-	rm -fr .tox/
 	rm -f .coverage
 	rm -fr htmlcov/
 	rm -f output.xml
 	rm -f report.html
 
-lint: ## check style with flake8
-	flake8 cumulusci tests
+lint: ## check style with ruff and pyright
+	ruff check cumulusci tests
+	ruff format --check cumulusci tests
 
 test: ## run tests quickly with the default Python
 	pytest
 
-test-all: ## run tests on every Python version with tox
-	tox
+test-all: ## run tests on every Python version via CI matrix
+	@echo "Multi-version testing runs in CI. Use 'pytest' for local testing."
 
 # Use CLASS_PATH to run coverage for a subset of tests.
 # $ make coverage CLASS_PATH="cumulusci/core/tests"
@@ -82,7 +82,6 @@ servedocs: docs ## compile the docs watching for changes
 	watchmedo shell-command -p '*.rst' -c '$(MAKE) -C docs html' -R -D .
 
 release: clean ## package and upload a release
-	python utility/pin_dependencies.py
 	hatch build
 	hatch publish
 
@@ -97,15 +96,11 @@ tag: clean
 	git tag -a -m 'version $$(hatch version)' v$$(hatch version)
 	git push --follow-tags
 
-update-deps:
-	echo Use the _Update Python Dependencies_ Github action for real releases
-	pip-compile --upgrade --resolver=backtracking --output-file=requirements/prod.txt pyproject.toml
-	pip-compile --upgrade --resolver=backtracking --output-file=requirements/dev.txt --all-extras pyproject.toml
+update-deps: ## update all dependencies via uv
+	uv lock --upgrade
 
-dev-install:
-	python -m pip install --upgrade pip pip-tools setuptools
-	pip-sync requirements/*.txt
-	python -m pip install -e .
+dev-install: ## install development dependencies via uv
+	uv sync --group dev
 
 schema:
 	python -c 'from cumulusci.utils.yaml import cumulusci_yml; open("cumulusci/schema/cumulusci.jsonschema.json", "w").write(cumulusci_yml.CumulusCIRoot.schema_json(indent=4))'

pyproject.toml

@@ -67,6 +67,7 @@ dev = [
     "factory-boy>=3.3.1",
     "furo>=2023.3.27",
     "jsonschema>=4.23.0",
+    "ruff>=0.15.8",
     "pytest>=7.0.1",
     "pytest-cov>=5.0.0",
     "pytest-random-order>=1.1.1",
@@ -117,7 +118,6 @@ include = [
 [tool.hatch.build.targets.sdist]
 include = [
     "/cumulusci",
-    "/requirements/*", # Needed by tox
     "README.md",       # needed by hatch-fancy-pypi-readme
     "docs/history.md",
     # ditto