chore: Move dev extras to dependency-groups

CONTRIBUTING.md

@@ -30,7 +30,7 @@ pip install -e .
 #### Development Build (Optional)
 To install development tools and the latest API modules directly from the master branch:
 ```sh
-pip install -e ".[dev]"
+uv pip install -e . --group dev
 ```
 
 ## Development Workflow

Makefile

@@ -67,7 +67,7 @@ uv-venv:
  # make test-python will produce html coverage by default. Run with `make test-python report=xml` to produce xml report.
 .PHONY: test-python
 test-python: uv-venv
-	@uv pip install -e ".[dev]"
+	@uv pip install -e . --group dev
 	@uv run coverage run --source=kubeflow.trainer.api.trainer_client,kubeflow.trainer.utils.utils -m pytest ./kubeflow/trainer/api/trainer_client_test.py
 	@uv run coverage report -m kubeflow/trainer/api/trainer_client.py kubeflow/trainer/utils/utils.py
 ifeq ($(report),xml)

pyproject.toml

@@ -31,7 +31,8 @@ dependencies = [
   "pydantic>=2.10.0",
   "kubeflow-trainer-api>=2.0.0",
 ]
-[project.optional-dependencies]
+
+[dependency-groups]
 dev = [
   "pytest>=7.0",
   "pytest-mock>=3.10",