fix: type in last README change #85

	name: CI

	# Lightweight master branch validation for CI badge status
	# Focused on core functionality testing for repository health indicator
	on:
	push:
	branches:
	- master

	env:
	PYTHON_VERSION: '3.12'

	jobs:
	ci:
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v4
	with:
	fetch-depth: 0

	- uses: actions/setup-python@v5
	with:
	python-version: ${{ env.PYTHON_VERSION }}

	- uses: actions/cache@v4
	with:
	path: ~/.cache/pip
	key: ${{ runner.os }}-pip-${{ hashFiles('requirements-dev.lock') }}
	restore-keys: \|
	${{ runner.os }}-pip-

	- name: Install system dependencies
	run: \|
	sudo apt-get update
	sudo apt-get install -y libhdf5-dev pkg-config

	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install -r requirements-dev.lock
	pip install -e .

	- name: Run core tests
	run: \|
	pytest --tb=short --disable-warnings tests/

	- name: Check code formatting
	run: \|
	black --check solarwindpy/
	flake8 solarwindpy/

	- name: Verify imports and basic functionality
	run: \|
	python -c "
	import solarwindpy as swp
	print(f'SolarWindPy version: {swp.__version__}')

	# Test core functionality
	import numpy as np
	from solarwindpy.core import Plasma, Ion

	print('✅ Core classes imported successfully')
	print('✅ Master branch validation complete')
	"

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