Add input validation and improve error handling #326

	name: CI

	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]

	jobs:
	build:
	strategy:
	matrix:
	platform: [ubuntu-latest, macos-latest, windows-latest]
	runs-on: ${{ matrix.platform }}

	steps:
	- uses: actions/checkout@v4

	- name: Setup Maven cache
	uses: actions/cache@v4
	with:
	path: ~/.m2/repository
	key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
	restore-keys: \|
	${{ runner.os }}-maven-

	- name: Set up JDK 17
	uses: actions/setup-java@v4
	with:
	java-version: '17'
	distribution: 'corretto'

	- name: Build with Maven
	run: ./mvnw -e --no-transfer-progress clean install
	continue-on-error: false

	- name: Check for changes
	shell: bash
	run: \|
	if ! git diff --exit-code; then
	echo "::error::Code changes detected - run './mvnw clean verify' locally"
	echo "::error::Modified files:"
	git diff --name-only
	exit 1
	fi

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